browser: Abstract message box dialog functions into its own header file.

chrome/browser/platform_util_mac.mm

 // Copyright (c) 2011 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/platform_util.h"
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 #include <CoreServices/CoreServices.h>
 
@@ skipping 134 matching lines @@
 }
 
 bool IsVisible(gfx::NativeView view) {
   // A reasonable approximation of how you'd expect this to behave.
   return (view &&
           ![view isHiddenOrHasHiddenAncestor] &&
           [view window] &&
           [[view window] isVisible]);
 }
 
-void SimpleErrorBox(gfx::NativeWindow parent,
-                    const string16& title,
-                    const string16& message) {
-  // Ignore the title; it's the window title on other platforms and ignorable.
-  NSAlert* alert = [[[NSAlert alloc] init] autorelease];
-  [alert addButtonWithTitle:l10n_util::GetNSString(IDS_OK)];
-  [alert setMessageText:base::SysUTF16ToNSString(message)];
-  [alert setAlertStyle:NSWarningAlertStyle];
-  [alert runModal];
-}
-
-bool SimpleYesNoBox(gfx::NativeWindow parent,
-                    const string16& title,
-                    const string16& message) {
-  // Ignore the title; it's the window title on other platforms and ignorable.
-  NSAlert* alert = [[[NSAlert alloc] init] autorelease];
-  [alert setMessageText:base::SysUTF16ToNSString(message)];
-  [alert setAlertStyle:NSWarningAlertStyle];
-
-  [alert addButtonWithTitle:
-      l10n_util::GetNSString(IDS_CONFIRM_MESSAGEBOX_YES_BUTTON_LABEL)];
-  [alert addButtonWithTitle:
-      l10n_util::GetNSString(IDS_CONFIRM_MESSAGEBOX_NO_BUTTON_LABEL)];
-
-  NSInteger result = [alert runModal];
-  return result == NSAlertFirstButtonReturn;
-}
-
 }  // namespace platform_util