Turn GoogleURLTrackerNavigationHelper(Impl) into a per-tab object.

chrome/browser/google/google_url_tracker_navigation_helper.h

 // Copyright (c) 2012 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_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_H_
 #define CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_H_
 
+#include "base/macros.h"
+
 class GoogleURLTracker;
-class InfoBarService;
-class Profile;
-
-namespace content {
-class NavigationController;
-}
 
 // A helper class for GoogleURLTracker that abstracts the details of listening
 // for various navigation events.
 class GoogleURLTrackerNavigationHelper {
  public:
-  virtual ~GoogleURLTrackerNavigationHelper() {}
+  explicit GoogleURLTrackerNavigationHelper(
+      GoogleURLTracker* google_url_tracker);
+  virtual ~GoogleURLTrackerNavigationHelper();
 
-  // Sets the GoogleURLTracker that is associated with this object.
-  virtual void SetGoogleURLTracker(GoogleURLTracker* tracker) = 0;
+  // Enables or disables listening for navigation commits.
+  // OnNavigationCommitted will be called for each navigation commit if
+  // listening is enabled.
+  virtual void SetListeningForNavigationCommit(bool listen) = 0;
 
-  // Enables or disables listening for navigation commits for the given
-  // NavigationController. OnNavigationCommitted will be called for each
-  // navigation commit if listening is enabled.
-  virtual void SetListeningForNavigationCommit(
-      const content::NavigationController* nav_controller,
-      bool listen) = 0;
+  // Returns whether or not this object is currently listening for navigation
+  // commits.
+  virtual bool IsListeningForNavigationCommit() = 0;
 
-  // Returns whether or not the observer is currently listening for navigation
-  // commits for the given NavigationController.
-  virtual bool IsListeningForNavigationCommit(
-      const content::NavigationController* nav_controller) = 0;
+  // Enables or disables listening for tab destruction. OnTabClosed will be
+  // called on tab destruction if listening is enabled.
+  virtual void SetListeningForTabDestruction(bool listen) = 0;
 
-  // Enables or disables listening for tab destruction for the given
-  // NavigationController. OnTabClosed will be called on tab destruction if
-  // listening is enabled.
-  virtual void SetListeningForTabDestruction(
-      const content::NavigationController* nav_controller,
-      bool listen) = 0;
+  // Returns whether or not this object is currently listening for tab
+  // destruction.
+  virtual bool IsListeningForTabDestruction() = 0;
 
-  // Returns whether or not the observer is currently listening for tab
-  // destruction for the given NavigationController.
-  virtual bool IsListeningForTabDestruction(
-      const content::NavigationController* nav_controller) = 0;
+ protected:
+  GoogleURLTracker* google_url_tracker() { return google_url_tracker_; }
+
+ private:
+  GoogleURLTracker* google_url_tracker_;
+
+  DISALLOW_COPY_AND_ASSIGN(GoogleURLTrackerNavigationHelper);
 };
 
 #endif  // CHROME_BROWSER_GOOGLE_GOOGLE_URL_TRACKER_NAVIGATION_HELPER_H_