Removing useless Win7 checks + standardize its use

chrome/browser/media/webrtc/webrtc_browsertest_base.cc

Index: chrome/browser/media/webrtc/webrtc_browsertest_base.cc
diff --git a/chrome/browser/media/webrtc/webrtc_browsertest_base.cc b/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
index 562ca644f58308216cd5b89fd62b6f097fb5b171..e258eb275084b33070d10876d06bd3f1a814593b 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
+++ b/chrome/browser/media/webrtc/webrtc_browsertest_base.cc
@@ -461,9 +461,9 @@ std::string WebRtcTestBase::GetStreamSize(
   return result.substr(3);
 }
 
-bool WebRtcTestBase::OnWin8() const {
+bool WebRtcTestBase::OnWin8OrHigher() const {
 #if defined(OS_WIN)
-  return base::win::GetVersion() > base::win::VERSION_WIN7;
+  return base::win::GetVersion() >= base::win::VERSION_WIN8;
 #else
   return false;
 #endif