Remove page IDs from three WebContentsObserver APIs that don't need it.

chrome/browser/favicon/favicon_handler.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_FAVICON_FAVICON_HANDLER_H_
 #define CHROME_BROWSER_FAVICON_FAVICON_HANDLER_H_
 
 #include <deque>
 #include <map>
 #include <vector>
@@ skipping 79 matching lines @@
                  FaviconDriver* driver,
                  Type icon_type,
                  bool download_largest_icon);
   virtual ~FaviconHandler();
 
   // Initiates loading the favicon for the specified url.
   void FetchFavicon(const GURL& url);
 
   // Message Handler.  Must be public, because also called from
   // PrerenderContents. Collects the |image_urls| list.
-  void OnUpdateFaviconURL(int32 page_id,
-                          const std::vector<content::FaviconURL>& candidates);
+  void OnUpdateFaviconURL(const std::vector<content::FaviconURL>& candidates);
 
   // Processes the current image_irls_ entry, requesting the image from the
   // history / download service.
   void ProcessCurrentUrl();
 
   // Message handler for ImageHostMsg_DidDownloadImage. Called when the image
   // at |image_url| has been downloaded.
   // |bitmaps| is a list of all the frames of the image at |image_url|.
   // |original_bitmap_sizes| are the sizes of |bitmaps| before they were resized
   // to the maximum bitmap size passed to DownloadFavicon().
@@ skipping 189 matching lines @@
   // Best image we've seen so far.  As images are downloaded from the page they
   // are stored here. When there is an exact match, or no more images are
   // available the favicon service and the NavigationEntry are updated (assuming
   // the image is for a favicon).
   FaviconCandidate best_favicon_candidate_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconHandler);
 };
 
 #endif  // CHROME_BROWSER_FAVICON_FAVICON_HANDLER_H_