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 802d4eba324aefe2afe3628832346c879ff54346..f18393ec0ae765514821f5759a102a070146c327 100644
--- a/content/public/test/browser_test_utils.cc
+++ b/content/public/test/browser_test_utils.cc
@@ -742,6 +742,13 @@ void SimulateKeyPress(WebContents* web_contents,
   ASSERT_EQ(modifiers, 0);
 }
 
+bool HasWebcamAvailableOnSystem(WebContents* tab_contents) {
+  std::string result;
+  EXPECT_TRUE(content::ExecuteScriptAndExtractString(
+      tab_contents, hasVideoInputDeviceOnSystem, &result));
+  return result == "has-video-input-device";
+}
+
 RenderFrameHost* ConvertToRenderFrameHost(WebContents* web_contents) {
   return web_contents->GetMainFrame();
 }