Remove remaining calls to deprecated MessageLoop methods on Mac.

chrome/browser/ui/cocoa/first_run_dialog.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/first_run_dialog.h"
 
 #include "base/mac/bundle_locations.h"
 #import "base/mac/scoped_nsobject.h"
 #include "base/memory/ref_counted.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "base/strings/sys_string_conversions.h"
+#include "base/threading/thread_task_runner_handle.h"
 #include "chrome/browser/first_run/first_run.h"
 #include "chrome/browser/first_run/first_run_dialog.h"
 #include "chrome/browser/metrics/metrics_reporting_state.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/search_engines/template_url_service_factory.h"
 #include "chrome/browser/shell_integration.h"
 #include "chrome/common/url_constants.h"
 #include "components/search_engines/template_url_service.h"
 #import "third_party/google_toolbox_for_mac/src/AppKit/GTMUILocalizerAndLayoutTweaker.h"
 #include "ui/base/l10n/l10n_util_mac.h"
@@ skipping 115 matching lines @@
 - (void)dealloc {
   [super dealloc];
 }
 
 - (IBAction)showWindow:(id)sender {
   // The main MessageLoop has not yet run, but has been spun. If we call
   // -[NSApplication runModalForWindow:] we will hang <http://crbug.com/54248>.
   // Therefore the main MessageLoop is run so things work.
 
   scoped_refptr<FirstRunShowBridge> bridge(new FirstRunShowBridge(self));
-  base::MessageLoop::current()->PostTask(FROM_HERE,
-      base::Bind(&FirstRunShowBridge::ShowDialog, bridge.get()));
-  base::MessageLoop::current()->Run();
+  base::ThreadTaskRunnerHandle::Get()->PostTask(
+      FROM_HERE, base::Bind(&FirstRunShowBridge::ShowDialog, bridge.get()));
+  base::RunLoop().Run();
 }
 
 - (void)show {
   NSWindow* win = [self window];
 
   if (!shell_integration::CanSetAsDefaultBrowser()) {
     [setAsDefaultCheckbox_ setHidden:YES];
   }
 
   // Only support the sizing the window once.
@@ skipping 102 matching lines @@
   [NSApp stopModal];
 }
 
 - (IBAction)learnMore:(id)sender {
   NSString* urlStr = base::SysUTF8ToNSString(chrome::kLearnMoreReportingURL);
   NSURL* learnMoreUrl = [NSURL URLWithString:urlStr];
   [[NSWorkspace sharedWorkspace] openURL:learnMoreUrl];
 }
 
 @end