[NTP Snippets] Clear the snippets when the user signs out

chrome/browser/android/ntp/ntp_snippets_bridge.cc

Index: chrome/browser/android/ntp/ntp_snippets_bridge.cc
diff --git a/chrome/browser/android/ntp/ntp_snippets_bridge.cc b/chrome/browser/android/ntp/ntp_snippets_bridge.cc
index 9e7a1717a423045b086f85130b03b627df9030ba..aa813a514522abfc63eae9611d3c0774e605bc54 100644
--- a/chrome/browser/android/ntp/ntp_snippets_bridge.cc
+++ b/chrome/browser/android/ntp/ntp_snippets_bridge.cc
@@ -168,6 +168,13 @@ void NTPSnippetsBridge::NTPSnippetsServiceShutdown() {
   snippet_service_observer_.Remove(ntp_snippets_service_);
 }
 
+void NTPSnippetsBridge::NTPSnippetsServiceCleared() {
+  // The user signed out or disabled sync. Since snippets rely on those, we
+  // clear them to be consistent with the initially signed out state.
+  JNIEnv* env = base::android::AttachCurrentThread();
+  Java_SnippetsBridge_onSnippetsCleared(env, observer_.obj());
+}
+
 void NTPSnippetsBridge::OnImageFetched(ScopedJavaGlobalRef<jobject> callback,
                                        const std::string& snippet_id,
                                        const SkBitmap* bitmap) {