Constrained Windows Cocoa: Part 4 Refactor ConstrainedWindowSupport

chrome/browser/ui/cocoa/extensions/shell_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/shell_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 36 matching lines @@
 
 - (void)windowDidResignKey:(NSNotification*)notification {
   if (shellWindow_)
     shellWindow_->WindowDidResignKey();
 }
 
 - (void)gtm_systemRequestsVisibilityForView:(NSView*)view {
   [[self window] makeKeyAndOrderFront:self];
 }
 
-- (void)attachConstrainedWindow:(ConstrainedWindowMac*)window {
+- (GTMWindowSheetController*)sheetController {
   if (!sheetController_.get()) {
     sheetController_.reset([[GTMWindowSheetController alloc]
         initWithWindow:[self window]
               delegate:self]);
   }
-
-  NSView* tabContentsView =
-      [window->owner()->web_contents()->GetNativeView() superview];
-  window->delegate()->RunSheet(sheetController_, tabContentsView);
-}
-
-- (void)removeConstrainedWindow:(ConstrainedWindowMac*)window {
-}
-
-- (BOOL)canAttachConstrainedWindow {
-  return YES;
+  return sheetController_;
 }
 
 - (void)executeCommand:(int)command {
   // No-op, swallow the event.
 }
 
 @end
 
 @interface ShellNSWindow : ChromeEventProcessingWindow
 
@@ skipping 375 matching lines @@
   NSWindow* window = [window_controller_ window];
   CHECK(!window || [window isKindOfClass:[ShellNSWindow class]]);
   return static_cast<ShellNSWindow*>(window);
 }
 
 // static
 NativeShellWindow* NativeShellWindow::Create(
     ShellWindow* shell_window, const ShellWindow::CreateParams& params) {
   return new ShellWindowCocoa(shell_window, params);
 }