Remove internals.setEnableMockPagePopup().

LayoutTests/fast/forms/resources/picker-common.js

 window.jsTestIsAsync = true;
 
 var popupWindow = null;
 
 var popupOpenCallback = null;
 
-function openPickerWithMock(input, callback) {
-    if (window.internals)
-        internals.setEnableMockPagePopup(true);
-    input.offsetTop; // Force to lay out
-    if (input.type === "color") {
-        input.focus();
-        eventSender.keyDown(" ");
-    } else {
-        sendKey(input, "Down", false, true);
-    }
-    popupWindow = document.getElementById('mock-page-popup').contentWindow;
-    if (typeof callback === "function") {
-        popupOpenCallback = callback;
-        popupWindow.addEventListener("didOpenPicker", popupOpenCallbackWrapper, false);
-    }
-}
-
 function popupOpenCallbackWrapper() {
     popupWindow.removeEventListener("didOpenPicker", popupOpenCallbackWrapper);
     setTimeout(popupOpenCallback, 0);
 }
 
 function waitUntilClosing(callback) {
     setTimeout(callback, 1);
 }
 
 function sendKey(input, keyName, ctrlKey, altKey) {
@@ skipping 16 matching lines @@
         popupOpenCallback = (function(callback) {
             // We need to move the window to the top left of available space
             // because the window will move back to (0, 0) when the
             // ShellViewMsg_SetTestConfiguration IPC arrives.
             window.moveTo();
             callback();
         }).bind(this, callback);
         popupWindow.addEventListener("didOpenPicker", popupOpenCallbackWrapper, false);
     }
 }