Revert of Removed duplicated JS hasVideoInputDeviceOnSystem() test helper

content/browser/webrtc/webrtc_webcam_browsertest.cc

Index: content/browser/webrtc/webrtc_webcam_browsertest.cc
diff --git a/content/browser/webrtc/webrtc_webcam_browsertest.cc b/content/browser/webrtc/webrtc_webcam_browsertest.cc
index 223c5de56c2b91a7e67a08999451815d6b37fa68..c0c7ad50e464a91f391c3518f7273fa49ae733a9 100644
--- a/content/browser/webrtc/webrtc_webcam_browsertest.cc
+++ b/content/browser/webrtc/webrtc_webcam_browsertest.cc
@@ -74,8 +74,10 @@
   NavigateToURL(shell(), url);
 
   std::string result;
-  if (!IsWebcamAvailableOnSystem(shell()->web_contents())) {
-    DVLOG(0) << "No video device; skipping test...";
+  ASSERT_TRUE(ExecuteScriptAndExtractString(
+      shell(), "hasVideoInputDeviceOnSystem()", &result));
+  if (result != "has-video-input-device") {
+    VLOG(0) << "No video device; skipping test...";
     return;
   }