aw: Use comparison DCHECKs where appropriate

android_webview/browser/aw_browser_context.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 "android_webview/browser/aw_browser_context.h"
 
 #include "android_webview/browser/aw_form_database_service.h"
 #include "android_webview/browser/aw_pref_store.h"
 #include "android_webview/browser/aw_quota_manager_bridge.h"
 #include "android_webview/browser/aw_resource_context.h"
@@ skipping 34 matching lines @@
 }  // namespace
 
 // Data reduction proxy is disabled by default.
 bool AwBrowserContext::data_reduction_proxy_enabled_ = false;
 
 AwBrowserContext::AwBrowserContext(
     const FilePath path,
     JniDependencyFactory* native_factory)
     : context_storage_path_(path),
       native_factory_(native_factory) {
-  DCHECK(g_browser_context == NULL);
+  DCHECK(!g_browser_context);
   g_browser_context = this;
 
   // This constructor is entered during the creation of ContentBrowserClient,
   // before browser threads are created. Therefore any checks to enforce
   // threading (such as BrowserThread::CurrentlyOn()) will fail here.
 }
 
 AwBrowserContext::~AwBrowserContext() {
-  DCHECK(g_browser_context == this);
+  DCHECK_EQ(this, g_browser_context);
   g_browser_context = NULL;
 }
 
 // static
 AwBrowserContext* AwBrowserContext::GetDefault() {
   // TODO(joth): rather than store in a global here, lookup this instance
   // from the Java-side peer.
   return g_browser_context;
 }
 
@@ skipping 201 matching lines @@
 
 void AwBrowserContext::RebuildTable(
     const scoped_refptr<URLEnumerator>& enumerator) {
   // Android WebView rebuilds from WebChromeClient.getVisitedHistory. The client
   // can change in the lifetime of this WebView and may not yet be set here.
   // Therefore this initialization path is not used.
   enumerator->OnComplete(true);
 }
 
 }  // namespace android_webview