Removing unnecessary dontwarns from cronet proguard configs

Bug: 887942
Change-Id: I120d6aa7681d7d86ce3ee9d2b8add7bd5dc0e0da
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1804075
Auto-Submit: Sam Maier <smaier@chromium.org>
Commit-Queue: Ryan Hamilton <rch@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#696870}

components/cronet/android/cronet_impl_native_proguard.cfg

@@ -5,28 +5,6 @@
     public <init>(android.content.Context);
 }
 
-# Suppress unnecessary warnings.
--dontnote org.chromium.net.ProxyChangeListener$ProxyReceiver
--dontnote org.chromium.net.AndroidKeyStore
-# Needs 'void setTextAppearance(int)' (API level 23).
--dontwarn org.chromium.base.ApiCompatibilityUtils
-# Needs 'boolean onSearchRequested(android.view.SearchEvent)' (API level 23).
--dontwarn org.chromium.base.WindowCallbackWrapper
-
-# Generated for chrome apk and not included into cronet.
--dontwarn org.chromium.base.library_loader.NativeLibraries
--dontwarn org.chromium.base.multidex.ChromiumMultiDexInstaller
--dontwarn org.chromium.base.metrics.CachedMetrics
--dontwarn org.chromium.base.library_loader.LibraryLoader
--dontwarn org.chromium.base.SysUtils
-
-# Objects of this type are passed around by native code, but the class
-# is never used directly by native code. Since the class is not loaded, it does
-# not need to be preserved as an entry point.
--dontnote org.chromium.net.UrlRequest$ResponseHeadersMap
-# https://android.googlesource.com/platform/sdk/+/marshmallow-mr1-release/files/proguard-android.txt#54
--dontwarn android.support.**
-
 # This class should be explicitly kept to avoid failure if
 # class/merging/horizontal proguard optimization is enabled.
 -keep class org.chromium.base.CollectionUtil

components/cronet/android/test/proguard.cfg

 # Proguard configuration that is common for all type of tests.
 
 -keepattributes Signature,InnerClasses,SourceFile,LineNumberTable,EnclosingMethod
--dontwarn io.netty.**
 -keep class io.netty.** { *; }
 # Keep ChromiumNativeTestSupport & ChromiumPlatformOnlyTestSupport since they are
 # instantiated through Reflection by the smoke tests.
 -keep class org.chromium.net.smoke.ChromiumNativeTestSupport
 -keep class org.chromium.net.smoke.ChromiumPlatformOnlyTestSupport
 
-# https://android.googlesource.com/platform/sdk/+/marshmallow-mr1-release/files/proguard-android.txt#54
--dontwarn android.support.**
-
 # Do not obfuscate this class for testing since some of the tests check the class
 # name in order to check that an instantiated engine is the Java one.
 -keepnames class org.chromium.net.impl.JavaCronetEngine
@@ -24,6 +20,3 @@
 
 -keep class org.chromium.net.TestFilesInstaller
 -keep class org.chromium.net.MetricsTestUtil
-
-# Generated for chrome apk and not included into cronet.
--dontwarn org.chromium.base.library_loader.NativeLibraries