favor DCHECK_CURRENTLY_ON for better logs in content/browser/[a-d]*

content/browser/browser_main_loop.cc

 // 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/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 334 matching lines @@
 #endif
   }
  private:
   DISALLOW_COPY_AND_ASSIGN(MemoryObserver);
 };
 
 
 // BrowserMainLoop construction / destruction =============================
 
 BrowserMainLoop* BrowserMainLoop::GetInstance() {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   return g_current_browser_main_loop;
 }
 
 BrowserMainLoop::BrowserMainLoop(const MainFunctionParams& parameters)
     : parameters_(parameters),
       parsed_command_line_(parameters.command_line),
       result_code_(RESULT_CODE_NORMAL_EXIT),
       created_threads_(false),
       // ContentMainRunner should have enabled tracing of the browser process
       // when kTraceStartup is in the command line.
@@ skipping 904 matching lines @@
 
 void BrowserMainLoop::EndStartupTracing() {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content