Clarify that NTPSnippetsBridge holds a Java SnippetsBridge.

chrome/browser/android/ntp/ntp_snippets_bridge.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_NTP_NTP_SNIPPETS_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_NTP_NTP_SNIPPETS_BRIDGE_H_
 
 #include <jni.h>
 
 #include "base/android/scoped_java_ref.h"
@@ skipping 13 matching lines @@
 // The C++ counterpart to SnippetsBridge.java. Enables Java code to access
 // the list of snippets to show on the NTP.
 //
 // This bridge is instantiated, owned, and destroyed from Java. There is one
 // instance for each NTP, and it is destroyed when the NTP is destroyed e.g.
 // when the user navigates away from it.
 class NTPSnippetsBridge
     : public ntp_snippets::ContentSuggestionsService::Observer {
  public:
   NTPSnippetsBridge(JNIEnv* env,
+                    const base::android::JavaParamRef<jobject>& j_bridge,
                     const base::android::JavaParamRef<jobject>& j_profile);
   void Destroy(JNIEnv* env, const base::android::JavaParamRef<jobject>& obj);
 
-  void SetObserver(JNIEnv* env,
-                   const base::android::JavaParamRef<jobject>& obj,
-                   const base::android::JavaParamRef<jobject>& j_observer);
-
   base::android::ScopedJavaLocalRef<jintArray> GetCategories(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj);
 
   int GetCategoryStatus(JNIEnv* env,
                         const base::android::JavaParamRef<jobject>& obj,
                         jint j_category_id);
 
   base::android::ScopedJavaLocalRef<jobject> GetCategoryInfo(
       JNIEnv* env,
@@ skipping 106 matching lines @@
       std::vector<ntp_snippets::ContentSuggestion> suggestions);
 
   ntp_snippets::ContentSuggestionsService* content_suggestions_service_;
   history::HistoryService* history_service_;
   base::CancelableTaskTracker tracker_;
 
   ScopedObserver<ntp_snippets::ContentSuggestionsService,
                  ntp_snippets::ContentSuggestionsService::Observer>
       content_suggestions_service_observer_;
 
-  // Used to notify the Java side when new snippets have been fetched.
-  base::android::ScopedJavaGlobalRef<jobject> observer_;
+  // The Java SnippetsBridge.
+  base::android::ScopedJavaGlobalRef<jobject> bridge_;
 
   base::WeakPtrFactory<NTPSnippetsBridge> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NTPSnippetsBridge);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_NTP_NTP_SNIPPETS_BRIDGE_H_