Switch content tests to use BrowserThreadImpl directly.

content/browser/renderer_host/resource_dispatcher_host_unittest.cc

Index: content/browser/renderer_host/resource_dispatcher_host_unittest.cc
diff --git a/content/browser/renderer_host/resource_dispatcher_host_unittest.cc b/content/browser/renderer_host/resource_dispatcher_host_unittest.cc
index 919674f4500cac30323dd29d957fbbcb83f7ba64..e78967a09319b37a46e32c225a11974a99fbec41 100644
--- a/content/browser/renderer_host/resource_dispatcher_host_unittest.cc
+++ b/content/browser/renderer_host/resource_dispatcher_host_unittest.cc
@@ -10,6 +10,7 @@
 #include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/process_util.h"
+#include "content/browser/browser_thread_impl.h"
 #include "content/browser/child_process_security_policy.h"
 #include "content/browser/download/download_id.h"
 #include "content/browser/mock_resource_context.h"
@@ -22,7 +23,6 @@
 #include "content/common/resource_messages.h"
 #include "content/common/resource_response.h"
 #include "content/common/view_messages.h"
-#include "content/test/test_browser_thread.h"
 #include "net/base/net_errors.h"
 #include "net/base/upload_data.h"
 #include "net/http/http_util.h"
@@ -32,6 +32,8 @@
 #include "testing/gtest/include/gtest/gtest.h"
 #include "webkit/appcache/appcache_interfaces.h"
 
+using content::BrowserThreadImpl;
+
 // TODO(eroman): Write unit tests for SafeBrowsing that exercise
 //               SafeBrowsingResourceHandler.
 
@@ -385,8 +387,8 @@ class ResourceDispatcherHostTest : public testing::Test,
   }
 
   MessageLoopForIO message_loop_;
-  content::TestBrowserThread ui_thread_;
-  content::TestBrowserThread io_thread_;
+  BrowserThreadImpl ui_thread_;
+  BrowserThreadImpl io_thread_;
   scoped_refptr<ForwardingFilter> filter_;
   ResourceDispatcherHost host_;
   ResourceIPCAccumulator accum_;