Speculative revert to see if this change introduced a performance regression on Mac intl perf bots.

chrome/browser/ui/browser_finder.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_UI_BROWSER_FINDER_H_
 #define CHROME_BROWSER_UI_BROWSER_FINDER_H_
 
 #include "chrome/browser/ui/browser.h"
 #include "ui/gfx/native_widget_types.h"
 
@@ skipping 34 matching lines @@
 // browser currently exists.
 Browser* FindBrowserWithID(SessionID::id_type desired_id);
 
 // Find the browser represented by |window| or NULL if not found.
 Browser* FindBrowserWithWindow(gfx::NativeWindow window);
 
 // Find the browser containing |web_contents| or NULL if none is found.
 // |web_contents| must not be NULL.
 Browser* FindBrowserWithWebContents(const content::WebContents* web_contents);
 
+// Returns the Browser which contains the tab with the given
+// NavigationController, also filling in |index| (if valid) with the tab's index
+// in the tab strip.  Returns NULL if not found.  This call is O(N) in the
+// number of tabs.
+Browser* FindBrowserForController(
+    const content::NavigationController* controller,
+    int* index);
+
 // Identical in behavior to BrowserList::GetLastActive(), except that the most
 // recently open browser owned by |profile| is returned. If none exist, returns
 // NULL.  WARNING: see warnings in BrowserList::GetLastActive().
 Browser* FindLastActiveWithProfile(Profile* profile);
 
 // Returns the number of browsers with the Profile |profile|.
 size_t GetBrowserCount(Profile* profile);
 
 // Returns the number of tabbed browsers with the Profile |profile|.
 size_t GetTabbedBrowserCount(Profile* profile);
 
 }  // namespace browser
 
 #endif  // CHROME_BROWSER_UI_BROWSER_FINDER_H_