Split regular and perf WebRTC browser tests, remove CPU test.

chrome/browser/media/webrtc_browsertest_base.cc

Index: chrome/browser/media/webrtc_browsertest_base.cc
diff --git a/chrome/browser/media/webrtc_browsertest_base.cc b/chrome/browser/media/webrtc_browsertest_base.cc
index f469ff960bd57cbd7f071c57f156475bb659d5a7..f427b2a2680216c199fefb30eec794dee1696aa6 100644
--- a/chrome/browser/media/webrtc_browsertest_base.cc
+++ b/chrome/browser/media/webrtc_browsertest_base.cc
@@ -20,6 +20,11 @@
 #include "content/public/test/browser_test_utils.h"
 #include "net/test/embedded_test_server/embedded_test_server.h"
 
+#if defined(OS_WIN)
+// For fine-grained suppression.
+#include "base/win/windows_version.h"
+#endif
+
 const char WebRtcTestBase::kAudioVideoCallConstraints[] =
     "'{audio: true, video: true}'";
 const char WebRtcTestBase::kAudioVideoCallConstraintsQVGA[] =
@@ -347,3 +352,11 @@ bool WebRtcTestBase::HasWebcamAvailableOnSystem(
       ExecuteJavascript("HasVideoSourceOnSystem();", tab_contents);
   return result == "has-video-source";
 }
+
+bool WebRtcTestBase::OnWinXp() const {
+#if defined(OS_WIN)
+  return base::win::GetVersion() <= base::win::VERSION_XP;
+#else
+  return false;
+#endif
+}