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

chrome/browser/autocomplete/history_contents_provider_unittest.cc

Index: chrome/browser/autocomplete/history_contents_provider_unittest.cc
diff --git a/chrome/browser/autocomplete/history_contents_provider_unittest.cc b/chrome/browser/autocomplete/history_contents_provider_unittest.cc
index f839babb8951152b4ce93ae04631e27bc0e14114..dafb3efb754ae7b1671a162ab1c541e07cf32257 100644
--- a/chrome/browser/autocomplete/history_contents_provider_unittest.cc
+++ b/chrome/browser/autocomplete/history_contents_provider_unittest.cc
@@ -14,7 +14,7 @@
 #include "chrome/browser/history/history.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_profile.h"
-#include "content/browser/browser_thread.h"
+#include "content/test/test_browser_thread.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using base::Time;
@@ -101,8 +101,8 @@ class HistoryContentsProviderTest : public testing::Test,
   }
 
   MessageLoopForUI message_loop_;
-  BrowserThread ui_thread_;
-  BrowserThread file_thread_;
+  content::TestBrowserThread ui_thread_;
+  content::TestBrowserThread file_thread_;
 
   scoped_ptr<TestingProfile> profile_;
   scoped_refptr<HistoryContentsProvider> provider_;