Prepare chrome/ for compilation with OS X 10.7 deployment target.

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"
+#include "base/mac/sdk_forward_declarations.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/web_contents_modal_dialog_host_cocoa.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.
@@ skipping 290 matching lines @@
     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]
                              willPositionSheet:nil
                                      usingRect:sheetFrame];
     viewFrame.size.height += NSMinY(customSheetFrame) - NSMinY(sheetFrame);
   }
 
-  viewFrame.origin = [[parentView window] convertBaseToScreen:viewFrame.origin];
+  viewFrame = [[parentView window] convertRectToScreen:viewFrame];
   return viewFrame;
 }
 
 - (NSPoint)originForSheetSize:(NSSize)sheetSize
               inContainerRect:(NSRect)containerRect {
   NSPoint origin;
   origin.x = roundf(NSMinX(containerRect) +
                     (NSWidth(containerRect) - sheetSize.width) / 2.0);
   origin.y = NSMaxY(containerRect) + 5 - sheetSize.height;
   return origin;
@@ skipping 22 matching lines @@
   if ([activeView_ isEqual:[info parentView]])
     activeView_.reset();
 
   [parentWindow_ removeChildWindow:[info overlayWindow]];
   [[info sheet] closeSheetWithAnimation:withAnimation];
   [[info overlayWindow] close];
   [sheets_ removeObject:info];
 }
 
 @end