[mac] Fix issue 159361, frameless app windows could become draggable.

chrome/browser/ui/cocoa/extensions/native_app_window_cocoa.mm

 // 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/ui/cocoa/extensions/native_app_window_cocoa.h"
 
 #include "base/mac/mac_util.h"
 #include "base/sys_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/cocoa/browser_window_utils.h"
@@ skipping 618 matching lines @@
   for (std::vector<gfx::Rect>::const_iterator iter =
            system_drag_exclude_areas_.begin();
        iter != system_drag_exclude_areas_.end();
        ++iter) {
     scoped_nsobject<NSView> controlRegion(
         [[ControlRegionView alloc] initWithAppWindow:this]);
     [controlRegion setFrame:NSMakeRect(iter->x(),
                                        webViewHeight - iter->bottom(),
                                        iter->width(),
                                        iter->height())];
+    [controlRegion setAutoresizingMask:NSViewWidthSizable|NSViewHeightSizable];
     [webView addSubview:controlRegion];
   }
 }
 
 void NativeAppWindowCocoa::FlashFrame(bool flash) {
   if (flash) {
     attention_request_id_ = [NSApp requestUserAttention:NSInformationalRequest];
   } else {
     [NSApp cancelUserAttentionRequest:attention_request_id_];
     attention_request_id_ = 0;
@@ skipping 109 matching lines @@
   CHECK(!window || [window isKindOfClass:[ShellNSWindow class]]);
   return static_cast<ShellNSWindow*>(window);
 }
 
 // static
 NativeAppWindow* NativeAppWindow::Create(
     ShellWindow* shell_window,
     const ShellWindow::CreateParams& params) {
   return new NativeAppWindowCocoa(shell_window, params);
 }