Introduced base class for WebRTC browser tests, cleaned up duplication.

chrome/browser/media/webrtc_browsertest_common.cc

Index: chrome/browser/media/webrtc_browsertest_common.cc
diff --git a/chrome/browser/media/webrtc_browsertest_common.cc b/chrome/browser/media/webrtc_browsertest_common.cc
index cf067b6dd6b1606e40a8841bfd2ccc86b92dd61d..1f8c121455d9db1de5236db72b93539a639e7380 100644
--- a/chrome/browser/media/webrtc_browsertest_common.cc
+++ b/chrome/browser/media/webrtc_browsertest_common.cc
@@ -4,26 +4,13 @@
 
 #include "chrome/browser/media/webrtc_browsertest_common.h"
 
-#include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
 #include "base/test/test_timeouts.h"
 #include "base/time/time.h"
-#include "chrome/browser/chrome_notification_types.h"
-#include "chrome/browser/infobars/infobar.h"
-#include "chrome/browser/infobars/infobar_service.h"
-#include "chrome/browser/media/media_stream_infobar_delegate.h"
 #include "chrome/browser/profiles/profile.h"
-#include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
-#include "chrome/browser/ui/tabs/tab_strip_model.h"
-#include "chrome/common/chrome_switches.h"
-#include "chrome/test/base/in_process_browser_test.h"
-#include "chrome/test/base/ui_test_utils.h"
-#include "chrome/test/ui/ui_test.h"
-#include "content/public/browser/notification_service.h"
 #include "content/public/test/browser_test_utils.h"
-#include "net/test/embedded_test_server/embedded_test_server.h"
 
 const int kDefaultPollIntervalMsec = 250;