Removed duplicated JS hasVideoInputDeviceOnSystem() test helper

content/browser/webrtc/webrtc_webcam_browsertest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/webrtc/webrtc_webcam_browsertest.h"
 
 #include "base/command_line.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ skipping 57 matching lines @@
 // want here since the bot runs tests sequentially on the device.
 IN_PROC_BROWSER_TEST_F(WebRtcWebcamBrowserTest,
                        MANUAL_CanAcquireVgaOnRealWebcam) {
   ASSERT_TRUE(embedded_test_server()->Start());
   GURL url(embedded_test_server()->GetURL(
       "/media/getusermedia-real-webcam.html"));
   NavigateToURL(shell(), url);
 
   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;
   }
 
   // GetUserMedia should acquire VGA by default.
   ASSERT_TRUE(ExecuteScriptAndExtractString(
       shell(), "getUserMediaAndReturnVideoDimensions({video: true})", &result));
 
   if (result == "640x480" || result == "480x640") {
     // Don't care if the device happens to be in landscape or portrait mode
     // since we don't know how it is oriented in the lab :)
     return;
   }
   FAIL() << "Expected resolution to be 640x480 or 480x640, got" << result;
 }
 
 }  // namespace content