[various] Deletes deprecated splash screen meta-data element (#4501)

Deletes deprecated splash screen meta-data element.

This is no longer needed to present a splash screen in a Flutter application, but will be removed soon. See [go/flutter-splash-screen-migration](http://go/flutter-splash-screen-migration) for more information.

Part of https://github.com/flutter/flutter/issues/105173.

.ci/legacy_project/all_packages/android/app/src/main/AndroidManifest.xml

@@ -18,15 +18,6 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
-            <!-- Displays an Android View that continues showing the launch screen
-                 Drawable until Flutter paints its first frame, then this splash
-                 screen fades out. A splash screen is useful to avoid any visual
-                 gap between the end of Android's launch screen and the painting of
-                 Flutter's first frame. -->
-            <meta-data
-              android:name="io.flutter.embedding.android.SplashScreenDrawable"
-              android:resource="@drawable/launch_background"
-              />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

packages/flutter_markdown/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Deletes deprecated splash screen meta-data element.
+
 ## 0.6.17
 
 * Introduces a new `MarkdownElementBuilder.visitElementAfterWithContext()` method passing the widget `BuildContext` and

packages/flutter_markdown/example/android/app/src/main/AndroidManifest.xml

@@ -18,15 +18,6 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
-            <!-- Displays an Android View that continues showing the launch screen
-                 Drawable until Flutter paints its first frame, then this splash
-                 screen fades out. A splash screen is useful to avoid any visual
-                 gap between the end of Android's launch screen and the painting of
-                 Flutter's first frame. -->
-            <meta-data
-              android:name="io.flutter.embedding.android.SplashScreenDrawable"
-              android:resource="@drawable/launch_background"
-              />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

packages/shared_preferences/shared_preferences/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Deletes deprecated splash screen meta-data element.
+
 ## 2.2.0
 
 * Adds `allowList` option to setPrefix.

packages/shared_preferences/shared_preferences/example/android/app/src/main/AndroidManifest.xml

@@ -18,15 +18,6 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
-            <!-- Displays an Android View that continues showing the launch screen
-                 Drawable until Flutter paints its first frame, then this splash
-                 screen fades out. A splash screen is useful to avoid any visual
-                 gap between the end of Android's launch screen and the painting of
-                 Flutter's first frame. -->
-            <meta-data
-              android:name="io.flutter.embedding.android.SplashScreenDrawable"
-              android:resource="@drawable/launch_background"
-              />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

packages/shared_preferences/shared_preferences_android/CHANGELOG.md

@@ -1,3 +1,7 @@
+## NEXT
+
+* Deletes deprecated splash screen meta-data element.
+
 ## 2.2.0
 
 * Adds `clearWithParameters` and `getAllWithParameters` methods.

packages/shared_preferences/shared_preferences_android/example/android/app/src/main/AndroidManifest.xml

@@ -18,15 +18,6 @@
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"
               />
-            <!-- Displays an Android View that continues showing the launch screen
-                 Drawable until Flutter paints its first frame, then this splash
-                 screen fades out. A splash screen is useful to avoid any visual
-                 gap between the end of Android's launch screen and the painting of
-                 Flutter's first frame. -->
-            <meta-data
-              android:name="io.flutter.embedding.android.SplashScreenDrawable"
-              android:resource="@drawable/launch_background"
-              />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>