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

components/variations/android/variations_seed_bridge.cc

Index: components/variations/android/variations_seed_bridge.cc
diff --git a/components/variations/android/variations_seed_bridge.cc b/components/variations/android/variations_seed_bridge.cc
index cf5cbe41db3ac65ff1fe91a503f42eb94c976575..8ed78b8f5c7cc1f987fc88eeb97b1119b17d0035 100644
--- a/components/variations/android/variations_seed_bridge.cc
+++ b/components/variations/android/variations_seed_bridge.cc
@@ -55,5 +55,10 @@ void GetVariationsFirstRunSeed(std::string* seed_data,
   *seed_country = ConvertJavaStringToUTF8(j_seed_country);
 }
 
+void ClearJavaFirstRunPrefs() {
+  JNIEnv* env = AttachCurrentThread();
+  Java_VariationsSeedBridge_clearFirstRunPrefs(env, GetApplicationContext());
+}
+
 }  // namespace android
 }  // namespace variations