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

components/variations/variations_seed_store.cc

Index: components/variations/variations_seed_store.cc
diff --git a/components/variations/variations_seed_store.cc b/components/variations/variations_seed_store.cc
index 84dca7e3ce91341fab819cdd6a711b0d122de543..91fc4e65f2997a553844e21fba5f83c6e9eb094e 100644
--- a/components/variations/variations_seed_store.cc
+++ b/components/variations/variations_seed_store.cc
@@ -17,6 +17,10 @@
 #include "crypto/signature_verifier.h"
 #include "third_party/protobuf/src/google/protobuf/io/coded_stream.h"
 
+#if defined(OS_ANDROID)
+#include "components/variations/android/variations_seed_bridge.h"
+#endif  // OS_ANDROID
+
 namespace variations {
 
 namespace {
@@ -384,7 +388,6 @@ void VariationsSeedStore::ImportFirstRunJavaSeed() {
     LOG(WARNING) << "First run variations seed is invalid.";
     return;
   }
-  // TODO(agulenko): Clear Java prefs.
   RecordFirstRunResult(FIRST_RUN_SEED_IMPORT_SUCCESS);
 }
 #endif  // OS_ANDROID
@@ -464,6 +467,16 @@ bool VariationsSeedStore::StoreSeedDataNoDelta(
   // in M45+.
   local_state_->ClearPref(prefs::kVariationsSeed);
 
+#if defined(OS_ANDROID)
+  // If currently we do not have any stored pref then we mark seed storing as
+  // successful on the Java side of Chrome for Android to avoid repeated seed
+  // fetches and clear preferences on the Java side.
+  if (local_state_->GetString(prefs::kVariationsCompressedSeed).empty()) {
+    android::MarkVariationsSeedAsStored();
+    android::ClearJavaFirstRunPrefs();
+  }
+#endif
+
   // Update the saved country code only if one was returned from the server.
   // Prefer the country code that was transmitted in the header over the one in
   // the seed (which is deprecated).