Implemented clearing Java prefs after pulling variations first run seed from Java to C++ side

components/variations/android/variations_seed_bridge.h

Index: components/variations/android/variations_seed_bridge.h
diff --git a/components/variations/android/variations_seed_bridge.h b/components/variations/android/variations_seed_bridge.h
index 83381fa4837e4c9678f041aaee40d7619348629e..1077039a48f87b61a815d869830e8080403c4974 100644
--- a/components/variations/android/variations_seed_bridge.h
+++ b/components/variations/android/variations_seed_bridge.h
@@ -18,6 +18,10 @@ void GetVariationsFirstRunSeed(std::string* seed_data,
                                std::string* seed_signature,
                                std::string* seed_country);
 
+// Clears first run seed preferences stored on the Java side of Chrome for
+// Android.
+void ClearJavaFirstRunPrefs();
+
 }  // namespace android
 }  // namespace variations