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 c0c7ad50e464a91f391c3518f7273fa49ae733a9..1bd96125a67c9bb1a59d743989a62d0a3ec36e1d 100644
--- a/content/browser/webrtc/webrtc_webcam_browsertest.cc
+++ b/content/browser/webrtc/webrtc_webcam_browsertest.cc
@@ -75,7 +75,7 @@ IN_PROC_BROWSER_TEST_F(WebRtcWebcamBrowserTest,
 
   std::string result;
   ASSERT_TRUE(ExecuteScriptAndExtractString(
-      shell(), "hasVideoInputDeviceOnSystem()", &result));
+      shell(), content::hasVideoInputDeviceFunction, &result));

[mcasas, 2016/09/06 15:34:54]

No need to specify content::

Also, here you seem to be calling a function
hasVideoInputDeviceFunction which is not defined
anywhere. Instead, I suggest replacing l.76-81 
with sth like:

  if (!content::HasWebcamAvailableOnSystem(shell()->web_contents())) {
    DVLOG(INFO) << "No webcam available, skipping test.";
    return;
  }

[lunalu1, 2016/09/06 20:56:13]

Done.

   if (result != "has-video-input-device") {
     VLOG(0) << "No video device; skipping test...";
     return;