Switch ChromeTestSuite to the same convention as ContentTestSuite:

chrome/browser/history/expire_history_backend_unittest.cc

Index: chrome/browser/history/expire_history_backend_unittest.cc
diff --git a/chrome/browser/history/expire_history_backend_unittest.cc b/chrome/browser/history/expire_history_backend_unittest.cc
index 5b2d1b82ec73c21c061bbdd26871412ec3af0190..6364fb3eabe5f48e38d03c72f7d8b97fbd2de3e3 100644
--- a/chrome/browser/history/expire_history_backend_unittest.cc
+++ b/chrome/browser/history/expire_history_backend_unittest.cc
@@ -24,7 +24,6 @@
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/thumbnail_score.h"
-#include "chrome/test/base/testing_browser_process_test.h"
 #include "chrome/test/base/testing_profile.h"
 #include "chrome/tools/profiles/thumbnail-inl.h"
 #include "content/browser/browser_thread.h"
@@ -49,7 +48,7 @@ namespace history {
 
 // ExpireHistoryTest -----------------------------------------------------------
 
-class ExpireHistoryTest : public TestingBrowserProcessTest,
+class ExpireHistoryTest : public testing::Test,
                           public BroadcastNotificationDelegate {
  public:
   ExpireHistoryTest()