Begun the DCHECK() cleanup. Starting off with /src/chrome/a* and /src/chrome/...

chrome/browser/automation/automation_provider.cc

 // 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/automation/automation_provider.h"
 
 #include <set>
 
 #include "base/callback.h"
 #include "base/debug/trace_event.h"
@@ skipping 802 matching lines @@
           (extension->location() == Extension::INTERNAL ||
            extension->location() == Extension::LOAD)) {
         result->push_back(extension->path());
       }
     }
   }
 }
 
 void AutomationProvider::WaitForExtensionTestResult(
     IPC::Message* reply_message) {
-  DCHECK(reply_message_ == NULL);
+  DCHECK(!reply_message_);
   reply_message_ = reply_message;
   // Call MaybeSendResult, because the result might have come in before
   // we were waiting on it.
   extension_test_result_observer_->MaybeSendResult();
 }
 
 void AutomationProvider::InstallExtensionAndGetHandle(
     const FilePath& crx_path, bool with_ui, IPC::Message* reply_message) {
   ExtensionService* service = profile_->GetExtensionService();
   ExtensionProcessManager* manager = profile_->GetExtensionProcessManager();
@@ skipping 158 matching lines @@
     }
   }
 }
 
 void AutomationProvider::SaveAsAsync(int tab_handle) {
   NavigationController* tab = NULL;
   TabContents* tab_contents = GetTabContentsForHandle(tab_handle, &tab);
   if (tab_contents)
     tab_contents->OnSavePage();
 }