platform_util::OpenItem fixes

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>
 
 #include "base/file_path.h"
 #include "base/logging.h"
 #include "base/mac/scoped_aedesc.h"
 #include "base/sys_string_conversions.h"
 #include "googleurl/src/gurl.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/l10n_util_mac.h"
 
 namespace platform_util {
 
 void ShowItemInFolder(const FilePath& full_path) {
-  DCHECK_EQ([NSThread currentThread], [NSThread mainThread]);
+  DCHECK([NSThread isMainThread]);
   NSString* path_string = base::SysUTF8ToNSString(full_path.value());
   if (!path_string || ![[NSWorkspace sharedWorkspace] selectFile:path_string
                                         inFileViewerRootedAtPath:nil])
     LOG(WARNING) << "NSWorkspace failed to select file " << full_path.value();
 }
 
 // This function opens a file.  This doesn't use LaunchServices or NSWorkspace
 // because of two bugs:
 //  1. Incorrect app activation with com.apple.quarantine:
 //     http://crbug.com/32921
 //  2. Silent no-op for unassociated file types: http://crbug.com/50263
 // Instead, an AppleEvent is constructed to tell the Finder to open the
 // document.
 void OpenItem(const FilePath& full_path) {
-  DCHECK_EQ([NSThread currentThread], [NSThread mainThread]);
+  DCHECK([NSThread isMainThread]);
   NSString* path_string = base::SysUTF8ToNSString(full_path.value());
   if (!path_string)
     return;
 
   OSErr status;
 
   // Create the target of this AppleEvent, the Finder.
   base::mac::ScopedAEDesc<AEAddressDesc> address;
   const OSType finderCreatorCode = 'MACS';
   status = AECreateDesc(typeApplSignature,  // type
@@ skipping 65 matching lines @@
                   kAENormalPriority,  // sendPriority
                   kAEDefaultTimeout,  // timeOutInTicks
                   NULL, // idleProc
                   NULL);  // filterProc
   if (status != noErr) {
     LOG(WARNING) << "Could not send AE to Finder in OpenItem()";
   }
 }
 
 void OpenExternal(const GURL& url) {
-  DCHECK_EQ([NSThread currentThread], [NSThread mainThread]);
+  DCHECK([NSThread isMainThread]);
   NSString* url_string = base::SysUTF8ToNSString(url.spec());
   NSURL* ns_url = [NSURL URLWithString:url_string];
   if (!ns_url || ![[NSWorkspace sharedWorkspace] openURL:ns_url])
     LOG(WARNING) << "NSWorkspace failed to open URL " << url;
 }
 
 gfx::NativeWindow GetTopLevel(gfx::NativeView view) {
   return [view window];
 }
 
@@ skipping 11 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]);
 }
 
 }  // namespace platform_util