Re-landing r170008, removing prefixed Shadow DOM APIs in Element.

The previous attempt, https://codereview.chromium.org/208503004, was reverted in https://codereview.chromium.org/212303005/.
The reason of reverting is that there is a JavaScript code uses prefixed Shadow DOM API in the chromium side.
I've fixed that in https://codereview.chromium.org/214093002/.

Let me re-land r170008. I hope it won't break anything this time.

BUG=242153

Review URL: https://codereview.chromium.org/218943003

git-svn-id: svn://svn.chromium.org/blink/trunk@170460 bbb929c8-8fbe-4397-9dbb-9b2b20218538

1 files changed, 2 insertions, 2 deletions

diff --git a/third_party/WebKit/PerformanceTests/ShadowDOM/ContentReprojection.html b/third_party/WebKit/PerformanceTests/ShadowDOM/ContentReprojection.html
index 28cfee4..9ecef55 100644
--- a/third_party/WebKit/PerformanceTests/ShadowDOM/ContentReprojection.html
+++ b/third_party/WebKit/PerformanceTests/ShadowDOM/ContentReprojection.html
@@ -25,11 +25,11 @@ function setup()
         host.appendChild(div);
     }
 
-    var shadowRoot = host.webkitCreateShadowRoot();
+    var shadowRoot = host.createShadowRoot();
     shadowRoot.innerHTML = '<div id="host2"><content></content></div>';
 
     var host2 = shadowRoot.getElementById('host2');
-    var shadowRoot2 = host2.webkitCreateShadowRoot();
+    var shadowRoot2 = host2.createShadowRoot();
     shadowRoot2.innerHTML = '<content select=".selected"></content>';
 }