Revert 34998, more stabbing in the dark to find a perf regression - Mac: impl...

chrome/browser/cocoa/tab_strip_view.mm

 // Copyright (c) 2009 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.
 
 #import "chrome/browser/cocoa/tab_strip_view.h"
 
-#import "chrome/browser/cocoa/browser_window_controller.h"
-#import "chrome/browser/cocoa/tab_strip_controller.h"
 #include "base/logging.h"
 
 @implementation TabStripView
 
 @synthesize newTabButton = newTabButton_;
 @synthesize dropArrowShown = dropArrowShown_;
 @synthesize dropArrowPosition = dropArrowPosition_;
 
 - (id)initWithFrame:(NSRect)frame {
   self = [super initWithFrame:frame];
@@ skipping 112 matching lines @@
             performSelector:@selector(_shouldMiniaturizeOnDoubleClick)])
       [[self window] performMiniaturize:self];
   } else {
     [super mouseUp:event];
   }
 
   // If clickCount is 0, the drag threshold was passed.
   lastMouseUp_ = (clickCount == 1) ? timestamp : -1000.0;
 }
 
-// (URLDropTarget protocol)
-- (id<URLDropTargetController>)urlDropController {
-  BrowserWindowController* windowController = [[self window] windowController];
-  DCHECK([windowController isKindOfClass:[BrowserWindowController class]]);
-  return [windowController tabStripController];
-}
-
-// (URLDropTarget protocol)
+// Required by |URLDropTargetHandler|.
 - (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {
   return [dropHandler_ draggingEntered:sender];
 }
 
-// (URLDropTarget protocol)
+// Required by |URLDropTargetHandler|.
 - (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {
   return [dropHandler_ draggingUpdated:sender];
 }
 
-// (URLDropTarget protocol)
+// Required by |URLDropTargetHandler|.
 - (void)draggingExited:(id<NSDraggingInfo>)sender {
   return [dropHandler_ draggingExited:sender];
 }
 
-// (URLDropTarget protocol)
+// Required by |URLDropTargetHandler|.
 - (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
   return [dropHandler_ performDragOperation:sender];
 }
 
 @end