MacViews: Fix window dragging on Sierra.

ui/views/cocoa/views_nswindow_delegate.mm

 // Copyright 2014 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 "ui/views/cocoa/views_nswindow_delegate.h"
 
 #include "base/logging.h"
 #import "ui/views/cocoa/bridged_content_view.h"
 #import "ui/views/cocoa/bridged_native_widget.h"
 #include "ui/views/widget/native_widget_mac.h"
@@ skipping 32 matching lines @@
   parent_->OnSystemControlTintChanged();
 }
 
 - (void)sheetDidEnd:(NSWindow*)sheet
          returnCode:(NSInteger)returnCode
         contextInfo:(void*)contextInfo {
   [sheet orderOut:nil];
   parent_->OnWindowWillClose();
 }
 
-- (BOOL)shouldRepostPendingLeftMouseDown:(NSPoint)locationInWindow {
-  return parent_->ShouldRepostPendingLeftMouseDown(locationInWindow);
-}
-
 // NSWindowDelegate implementation.
 
 - (void)windowDidFailToEnterFullScreen:(NSWindow*)window {
   // Cocoa should already have sent an (unexpected) windowDidExitFullScreen:
   // notification, and the attempt to get back into fullscreen should fail.
   // Nothing to do except verify |parent_| is no longer trying to fullscreen.
   DCHECK(!parent_->target_fullscreen_state());
 }
 
 - (void)windowDidFailToExitFullScreen:(NSWindow*)window {
@@ skipping 72 matching lines @@
             usingRect:(NSRect)defaultSheetLocation {
   // As per NSWindowDelegate documentation, the origin indicates the top left
   // point of the host frame in window coordinates. The width changes the
   // animation from vertical to trapezoid if it is smaller than the width of the
   // dialog. The height is ignored but should be set to zero.
   return NSMakeRect(0, [self nativeWidgetMac]->SheetPositionY(),
                     NSWidth(defaultSheetLocation), 0);
 }
 
 @end