Minor cleaning of shell javascript dialogs.

content/shell/shell_javascript_dialog_mac.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 "content/shell/shell_javascript_dialog.h"
 
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
 #import "base/memory/scoped_nsobject.h"
@@ skipping 86 matching lines @@
   bool text_field =
       javascript_message_type == ui::JAVASCRIPT_MESSAGE_TYPE_PROMPT;
   bool one_button =
       javascript_message_type == ui::JAVASCRIPT_MESSAGE_TYPE_ALERT;
 
   helper_ =
       [[ShellJavaScriptDialogHelper alloc] initHelperWithCreator:creator
                                                      andCallback:callback];
 
   // Show the modal dialog.
-  alert_ = [helper_ alert];
+  NSAlert* alert = [helper_ alert];
   NSTextField* field = nil;
   if (text_field) {
     field = [helper_ textField];
     [field setStringValue:base::SysUTF16ToNSString(default_prompt_text)];
   }
-  [alert_ setDelegate:helper_];
-  [alert_ setInformativeText:base::SysUTF16ToNSString(message_text)];
-  [alert_ setMessageText:@"Javascript alert"];
-  [alert_ addButtonWithTitle:@"OK"];
+  [alert setDelegate:helper_];
+  [alert setInformativeText:base::SysUTF16ToNSString(message_text)];
+  [alert setMessageText:@"Javascript alert"];
+  [alert addButtonWithTitle:@"OK"];
   if (!one_button) {
-    NSButton* other = [alert_ addButtonWithTitle:@"Cancel"];
+    NSButton* other = [alert addButtonWithTitle:@"Cancel"];
     [other setKeyEquivalent:@"\e"];
   }
 
-  [alert_
+  [alert
       beginSheetModalForWindow:nil  // nil here makes it app-modal
                  modalDelegate:helper_
                 didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:)
                    contextInfo:this];
 
-  if ([alert_ accessoryView])
-    [[alert_ window] makeFirstResponder:[alert_ accessoryView]];
+  if ([alert accessoryView])
+    [[alert window] makeFirstResponder:[alert accessoryView]];
 }
 
 ShellJavaScriptDialog::~ShellJavaScriptDialog() {
   [helper_ release];
 }
 
 void ShellJavaScriptDialog::Cancel() {
   [helper_ cancel];
 }
 
 }  // namespace content