mac: drop NOTIMPLEMENTED in GotFocus()...

chrome/browser/tab_contents/tab_contents_view_mac.mm

 // Copyright (c) 2006-2008 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/tab_contents/tab_contents_view_mac.h"
 
 #include <string>
 
 #include "chrome/browser/browser.h" // TODO(beng): this dependency is awful.
 #include "chrome/browser/cocoa/sad_tab_view.h"
@@ skipping 173 matching lines @@
     // that selection.
     SetInitialFocus();
   }
 }
 
 void TabContentsViewMac::UpdateDragCursor(WebDragOperation operation) {
   [cocoa_view_ setCurrentDragOperation: operation];
 }
 
 void TabContentsViewMac::GotFocus() {
-  NOTIMPLEMENTED();
+  // This is only used in the views FocusManager stuff but it bleeds through
+  // all subclasses. http://crbug.com/21875
 }
 
 // This is called when we the renderer asks us to take focus back (i.e., it has
 // iterated past the last focusable element on the page).
 void TabContentsViewMac::TakeFocus(bool reverse) {
   if (reverse) {
     [[cocoa_view_ window] selectPreviousKeyView:cocoa_view_.get()];
   } else {
     [[cocoa_view_ window] selectNextKeyView:cocoa_view_.get()];
   }
@@ skipping 204 matching lines @@
 }
 
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
   return [dropTarget_ performDragOperation:sender view:self];
 }
 
 // Tons of stuff goes here, where we grab events going on in Cocoaland and send
 // them into the C++ system. TODO(avi): all that jazz
 
 @end