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

chrome/browser/favicon/favicon_handler.cc

 // 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.
 
 #include "chrome/browser/favicon/favicon_handler.h"
 
 #include "build/build_config.h"
 
 #include <algorithm>
 #include <vector>
@@ skipping 352 matching lines @@
     return;
 
   gfx::Image image_with_adjusted_colorspace = image;
   FaviconUtil::SetFaviconColorSpace(&image_with_adjusted_colorspace);
 
   entry->GetFavicon().image = image_with_adjusted_colorspace;
   NotifyFaviconUpdated(icon_url_changed);
 }
 
 void FaviconHandler::OnUpdateFaviconURL(
-    int32 page_id,
     const std::vector<FaviconURL>& candidates) {
   image_urls_.clear();
   best_favicon_candidate_ = FaviconCandidate();
   for (std::vector<FaviconURL>::const_iterator i = candidates.begin();
        i != candidates.end(); ++i) {
     if (!i->icon_url.is_empty() && (i->icon_type & icon_types_))
       image_urls_.push_back(*i);
   }
 
   // TODO(davemoore) Should clear on empty url. Currently we ignore it.
@@ skipping 333 matching lines @@
     } else {
       gfx::Size largest = i->icon_sizes[index];
       i->icon_sizes.clear();
       i->icon_sizes.push_back(largest);
       ++i;
     }
   }
   std::stable_sort(image_urls_.begin(), image_urls_.end(),
                    CompareIconSize);
 }