Ensure dialogs are centered on browser windows.

chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.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.
 
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_controller.h"
 
 #include <map>
 
 #include "base/logging.h"
 #import "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet.h"
 #include "chrome/browser/ui/cocoa/constrained_window/constrained_window_sheet_info.h"
+#import "chrome/browser/ui/cocoa/tabs/tab_strip_controller.h"
 
 namespace {
 
 // Maps parent windows to sheet controllers.
 NSMutableDictionary* g_sheetControllers;
 
 // Get a value for the given window that can be used as a key in a dictionary.
 NSValue* GetKeyForParentWindow(NSWindow* parent_window) {
   return [NSValue valueWithNonretainedObject:parent_window];
 }
@@ skipping 214 matching lines @@
       [self findSheetInfoForParentView:parentView];
   if (!info)
     return;
 
   NSRect rect = [self overlayWindowFrameForParentView:parentView];
   [[info overlayWindow] setFrame:rect display:YES];
   [[info sheet] updateSheetPosition];
 }
 
 - (NSRect)overlayWindowFrameForParentView:(NSView*)parentView {
-  NSRect viewFrame = [parentView convertRect:[parentView bounds] toView:nil];
+  NSRect viewFrame = GetSheetParentBoundsForParentView(parentView);
 
   id<NSWindowDelegate> delegate = [[parentView window] delegate];
   if ([delegate respondsToSelector:@selector(window:
                                   willPositionSheet:
                                           usingRect:)]) {
     NSRect sheetFrame = NSZeroRect;
     // This API needs Y to be the distance from the bottom of the overlay to
     // the top of the sheet. X, width, and height are ignored.
     sheetFrame.origin.y = NSMaxY(viewFrame);
     NSRect customSheetFrame = [delegate window:[parentView window]
@@ skipping 35 matching lines @@
                 name:NSWindowDidResizeNotification
               object:parentWindow_];
 
   [parentWindow_ removeChildWindow:[info overlayWindow]];
   [[info sheet] closeSheetWithAnimation:withAnimation];
   [[info overlayWindow] close];
   [sheets_ removeObject:info];
 }
 
 @end