Split BrowserThread into public API and private implementation, step 1.

content/browser/renderer_host/media/audio_renderer_host_unittest.cc

Index: content/browser/renderer_host/media/audio_renderer_host_unittest.cc
diff --git a/content/browser/renderer_host/media/audio_renderer_host_unittest.cc b/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
index cbf28f145965d1a137d21879fec9878f49d52513..36b29e2b55433bfb8b85846264768343d75773ce 100644
--- a/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
+++ b/content/browser/renderer_host/media/audio_renderer_host_unittest.cc
@@ -8,11 +8,11 @@
 #include "base/message_loop.h"
 #include "base/process_util.h"
 #include "base/sync_socket.h"
-#include "content/browser/browser_thread.h"
 #include "content/browser/mock_resource_context.h"
 #include "content/browser/renderer_host/media/audio_renderer_host.h"
 #include "content/browser/renderer_host/media/mock_media_observer.h"
 #include "content/common/media/audio_messages.h"
+#include "content/test/test_browser_thread.h"
 #include "ipc/ipc_message_utils.h"
 #include "media/audio/audio_manager.h"
 #include "media/audio/fake_audio_output_stream.h"
@@ -175,8 +175,10 @@ class AudioRendererHostTest : public testing::Test {
     message_loop_.reset(new MessageLoop(MessageLoop::TYPE_IO));
 
     // Claim to be on both the UI and IO threads to pass all the DCHECKS.
-    io_thread_.reset(new BrowserThread(BrowserThread::IO, message_loop_.get()));
-    ui_thread_.reset(new BrowserThread(BrowserThread::UI, message_loop_.get()));
+    io_thread_.reset(new content::TestBrowserThread(BrowserThread::IO,
+                                                    message_loop_.get()));
+    ui_thread_.reset(new content::TestBrowserThread(BrowserThread::UI,
+                                                    message_loop_.get()));
 
     observer_.reset(new MockMediaObserver());
     content::MockResourceContext* context =
@@ -357,8 +359,8 @@ class AudioRendererHostTest : public testing::Test {
   scoped_ptr<MockMediaObserver> observer_;
   scoped_refptr<MockAudioRendererHost> host_;
   scoped_ptr<MessageLoop> message_loop_;
-  scoped_ptr<BrowserThread> io_thread_;
-  scoped_ptr<BrowserThread> ui_thread_;
+  scoped_ptr<content::TestBrowserThread> io_thread_;
+  scoped_ptr<content::TestBrowserThread> ui_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(AudioRendererHostTest);
 };