Clean up instances of Android platform until it's opensourced

RELNOTES=n/a

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=193965040

api/platformprovider/main/java/com/google/common/flogger/backend/PlatformProviderGenerator.java

@@ -60,9 +60,6 @@
 public final class PlatformProviderGenerator {
   private static final String[] PLATFORM_CLASSES =
       new String[] {
-        // Note: Order matters. The Android platform should come first, as it may coexist with
-        // GooglePlatform in certain cases.
-        "Lcom/google/common/flogger/backend/android/AndroidPlatform;",
         "Lcom/google/common/flogger/backend/system/DefaultPlatform;",
       };
 

api/proguard.cfg

@@ -1,4 +1,3 @@
 # Don't warn about the platforms not being found - they aren't available
 # everywhere, by design. Platforms are loaded dynamically at runtime.
--dontwarn com.google.common.flogger.backend.android.AndroidPlatform
 -dontwarn com.google.common.flogger.backend.system.DefaultPlatform

api/src/main/java/com/google/common/flogger/backend/Platform.java

@@ -54,8 +54,6 @@ public abstract class Platform {
   // used.
   private static final String[] AVAILABLE_PLATFORMS =
       new String[] {
-        // Look for Android first as reflection is slow on Android, so don't test others first.
-        ANDROID_PLATFORM,
         // The fallback/default platform gives a workable, logging backend.
         DEFAULT_PLATFORM
       };