Clean up unnecessary proguard files in frameworks/base

Delete proguard files that are either unused or redundant with
global or aapt-generated proguard flags. This change is a no-op.

Bug: 248580093
Change-Id: I6dcb3fb9584e9a15ac66104df6696780c166054d
Test: m + verify identical builds

packages/Keyguard/proguard.flags

--keep public class * {
-  public void setBackgroundAlpha(float);
-  public float getBackgroundAlpha();
-  public void setContentAlpha(float);
-  public float getContentAlpha();
-  public void setAlpha(float);
-  public float getAlpha();
-  public void setAlpha(int);
-  public int getAlpha();
-  public void setRotationX(float);
-  public float getRotationX();
-  public void setRotationY(float);
-  public float getRotationY();
-  public void setPivotX(float);
-  public float getPivotX();
-  public void setPivotY(float);
-  public float getPivotY();
-  public void setScaleX(float);
-  public float getScaleX();
-  public void setScaleY(float);
-  public float getScaleY();
-  public void setTranslationX(float);
-  public float getTranslationX();
-  public void setTranslationY(float);
-  public float getTranslationY();
-}
-

packages/SharedStorageBackup/Android.bp

@@ -27,9 +27,6 @@ android_app {
     name: "SharedStorageBackup",
     defaults: ["platform_app_defaults"],
     srcs: ["src/**/*.java"],
-    optimize: {
-        proguard_flags_files: ["proguard.flags"],
-    },
     platform_apis: true,
     certificate: "platform",
     privileged: true,

packages/SharedStorageBackup/proguard.flags

--keep class com.android.sharedstoragebackup.SharedStorageAgent
--keep class com.android.sharedstoragebackup.ObbBackupService

packages/WallpaperBackup/Android.bp

@@ -27,9 +27,6 @@ android_app {
     name: "WallpaperBackup",
     defaults: ["platform_app_defaults"],
     srcs: ["src/**/*.java"],
-    optimize: {
-        proguard_flags_files: ["proguard.flags"],
-    },
     platform_apis: true,
     certificate: "platform",
     privileged: false,

packages/WallpaperBackup/proguard.flags

--keep class com.android.wallpaperbackup.WallpaperBackupAgent

startop/apps/ColorChanging/app/build.gradle

@@ -14,7 +14,7 @@ android {
     buildTypes {
         release {
             minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt')
         }
     }
 }

startop/apps/ColorChanging/app/proguard-rules.pro

-# Add project specific ProGuard rules here.
-# You can control the set of applied configuration files using the
-# proguardFiles setting in build.gradle.
-#
-# For more details, see
-#   http://developer.android.com/guide/developing/tools/proguard.html
-
-# If your project uses WebView with JS, uncomment the following
-# and specify the fully qualified class name to the JavaScript interface
-# class:
-#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
-#   public *;
-#}
-
-# Uncomment this to preserve the line number information for
-# debugging stack traces.
-#-keepattributes SourceFile,LineNumberTable
-
-# If you keep the line number information, uncomment this to
-# hide the original source file name.
-#-renamesourcefileattribute SourceFile