Revert of Removed duplicated JS hasVideoInputDeviceOnSystem() test helper

content/public/test/browser_test_utils.cc

Index: content/public/test/browser_test_utils.cc
diff --git a/content/public/test/browser_test_utils.cc b/content/public/test/browser_test_utils.cc
index 41df0cc65ed839dfd85fe5c0a09e5b4f8ef5ee78..802d4eba324aefe2afe3628832346c879ff54346 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -408,30 +408,6 @@
   } while (status != net::Filter::FILTER_DONE);
 }
 
-// Queries for video input devices on the current system using the getSources
-// API.
-//
-// This does not guarantee that a getUserMedia with video will succeed, as the
-// camera could be busy for instance.
-//
-// Returns has-video-input-device to the test if there is a webcam available,
-// no-video-input-devices otherwise.
-const char kHasVideoInputDeviceOnSystem[] =
-    "(function() {"
-    "navigator.mediaDevices.enumerateDevices()"
-    ".then(function(devices) {"
-    "devices.forEach(function(device) {"
-    "if (device.kind == 'video') {"
-    "returnToTest('has-video-input-device');"
-    "return;"
-    "}"
-    "});"
-    "returnToTest('no-video-input-devices');"
-    "});"
-    "})()";
-
-const char kHasVideoInputDevice[] = "has-video-input-device";
-
 }  // namespace
 
 bool NavigateIframeToURL(WebContents* web_contents,
@@ -766,13 +742,6 @@
   ASSERT_EQ(modifiers, 0);
 }
 
-bool IsWebcamAvailableOnSystem(WebContents* web_contents) {
-  std::string result;
-  EXPECT_TRUE(content::ExecuteScriptAndExtractString(
-      web_contents, kHasVideoInputDeviceOnSystem, &result));
-  return result == kHasVideoInputDevice;
-}
-
 RenderFrameHost* ConvertToRenderFrameHost(WebContents* web_contents) {
   return web_contents->GetMainFrame();
 }