Android: Remove proguard rules from android_arch_lifecycle_runtime_java

They are keeping a few unused types for no reason.

Bug: 887942

Change-Id: I4460c105b16ecdae504dd85cb185bac7fd4416a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1695690
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#676157}

chrome/android/java/monochrome_public_bundle.proguard_flags.expected

@@ -411,26 +411,6 @@
 
 -dontwarn com.google.protobuf.nano.NanoEnumValue
 
-################################################################################
-# gen/third_party/android_deps/android_arch_lifecycle_runtime_java/proguard.txt
-################################################################################
--keepattributes *Annotation*
-
--keepclassmembers enum android.arch.lifecycle.Lifecycle$Event {
-    <fields>;
-}
-
--keep class * implements android.arch.lifecycle.LifecycleObserver {
-}
-
--keep class * implements android.arch.lifecycle.GeneratedAdapter {
-    <init>(...);
-}
-
--keepclassmembers class ** {
-    @android.arch.lifecycle.OnLifecycleEvent *;
-}
-
 ################################################################################
 # gen/third_party/android_deps/com_android_support_animated_vector_drawable_java/proguard.txt
 ################################################################################

third_party/android_deps/BUILD.gn

@@ -88,6 +88,9 @@ android_aar_prebuilt("android_arch_lifecycle_runtime_java") {
     ":android_arch_core_common_java",
     ":android_arch_lifecycle_common_java",
   ]
+
+  # https://crbug.com/887942#c1
+  ignore_proguard_configs = true
 }
 
 # This is generated, do not edit. Update BuildConfigGenerator.groovy instead.

tools/android/roll/android_deps/buildSrc/src/main/groovy/BuildConfigGenerator.groovy

@@ -239,6 +239,10 @@ class BuildConfigGenerator extends DefaultTask {
             }
         }
         switch(dependencyId) {
+            case 'android_arch_lifecycle_runtime_java':
+                sb.append('  # https://crbug.com/887942#c1\n')
+                sb.append('  ignore_proguard_configs = true\n')
+                break
             case 'com_android_support_support_compat':
             case 'com_android_support_support_media_compat':
                 // Target has AIDL, but we don't support it yet: http://crbug.com/644439