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

components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java

Index: components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java
diff --git a/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java b/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java
index c752d884b1fb67c05c0648f2f4bd1d2de2d90f26..daf433d20a828665c5cfc9610b39d451ad29065f 100644
--- a/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java
+++ b/components/variations/android/java/src/org/chromium/components/variations/firstrun/VariationsSeedService.java
@@ -27,16 +27,29 @@ public class VariationsSeedService extends IntentService {
     private static final int READ_TIMEOUT = 10000; // time in ms
     private static final int REQUEST_TIMEOUT = 15000; // time in ms
 
+    // Static variable that indicates a status of the variations seed fetch. If one request is in
+    // progress, we do not start another fetch.
+    private static boolean sFetchInProgress = false;
+
     public VariationsSeedService() {
         super(TAG);
     }
 
     @Override
     public void onHandleIntent(Intent intent) {
+        // Check if any variations seed fetch is in progress, or the seed has been already fetched,
+        // or seed has been successfully stored on the C++ side.
+        if (sFetchInProgress || VariationsSeedBridge.hasJavaPref(getApplicationContext())
+                || VariationsSeedBridge.hasNativePref(getApplicationContext())) {
+            return;
+        }
+        sFetchInProgress = true;
         try {
             downloadContent(new URL(VARIATIONS_SERVER_URL));
         } catch (MalformedURLException e) {
             Log.w(TAG, "Variations server URL is malformed.", e);
+        } finally {
+            sFetchInProgress = false;
         }
     }