favor DCHECK_CURRENTLY_ON for better logs in android_webview/

android_webview/native/aw_pdf_exporter.cc

 // Copyright 2013 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/native/aw_pdf_exporter.h"
 
 #include "base/android/jni_android.h"
 #include "base/logging.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_contents.h"
@@ skipping 27 matching lines @@
   if (obj.is_null())
     return;
   // Clear the Java peer's weak pointer to |this| object.
   Java_AwPdfExporter_setNativeAwPdfExporter(env, obj.obj(), 0);
 }
 
 void AwPdfExporter::ExportToPdf(JNIEnv* env,
                                 jobject obj,
                                 int fd,
                                 jobject cancel_signal) {
-  DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
+  DCHECK_CURRENTLY_ON(BrowserThread::UI);
   CreatePdfSettings(env, obj);
   PrintManager* print_manager =
       PrintManager::CreateForWebContents(
           web_contents_, print_settings_.get(), fd, this);
   if (!print_manager->PrintNow())
     DidExportPdf(false);
 }
 
 namespace {
 // Converts from 1/1000 of inches to device units using DPI.
@@ skipping 49 matching lines @@
   // TODO(sgurun) implement. Needs connecting with the |cancel_signal| passed
   // in the constructor.
   return false;
 }
 
 bool RegisterAwPdfExporter(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
 
 }  // namespace android_webview