Switch content tests to use BrowserThreadImpl directly.

content/browser/download/save_package_unittest.cc

Index: content/browser/download/save_package_unittest.cc
diff --git a/content/browser/download/save_package_unittest.cc b/content/browser/download/save_package_unittest.cc
index d8750e79ea37392e3357fbb5fd20ac5c858109aa..4742ac9c373e06492aab71aa196a04f69a609f69 100644
--- a/content/browser/download/save_package_unittest.cc
+++ b/content/browser/download/save_package_unittest.cc
@@ -9,14 +9,16 @@
 #include "base/scoped_temp_dir.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
+#include "content/browser/browser_thread_impl.h"
 #include "content/browser/download/save_package.h"
 #include "content/browser/net/url_request_mock_http_job.h"
 #include "content/browser/renderer_host/test_render_view_host.h"
 #include "content/browser/tab_contents/test_tab_contents.h"
-#include "content/test/test_browser_thread.h"
 #include "googleurl/src/gurl.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using content::BrowserThreadImpl;
+
 #define FPL FILE_PATH_LITERAL
 #if defined(OS_WIN)
 #define HTML_EXTENSION ".htm"
@@ -119,7 +121,7 @@ class SavePackageTest : public RenderViewHostTestHarness {
   }
 
  private:
-  content::TestBrowserThread browser_thread_;
+  BrowserThreadImpl browser_thread_;
 
   // SavePackage for successfully generating file name.
   scoped_refptr<SavePackage> save_package_success_;