[DevTools] Drop "ui" module from toolbox.

Source/devtools/front_end/host/DOMExtension.js

Index: Source/devtools/front_end/host/DOMExtension.js
diff --git a/Source/devtools/front_end/ui/DOMExtension.js b/Source/devtools/front_end/host/DOMExtension.js
similarity index 97%
rename from Source/devtools/front_end/ui/DOMExtension.js
rename to Source/devtools/front_end/host/DOMExtension.js
index ff5133ca303321a15b6347fb26b83843aaad9f96..d22335c4777ef27c3f659ffc6382fc54088221e7 100644
--- a/Source/devtools/front_end/ui/DOMExtension.js
+++ b/Source/devtools/front_end/host/DOMExtension.js
@@ -277,24 +277,6 @@ Constraints.prototype.addHeight = function(value)
 }
 
 /**
- * @param {?Element=} containerElement
- * @return {!Size}
- */
-Element.prototype.measurePreferredSize = function(containerElement)
-{
-    containerElement = containerElement || this.ownerDocument.body;
-    containerElement.appendChild(this);
-    var fakingComponentRoot = WebInspector.installComponentRootStyles(this);
-    this.positionAt(0, 0);
-    var result = new Size(this.offsetWidth, this.offsetHeight);
-    this.positionAt(undefined, undefined);
-    this.remove();
-    if (fakingComponentRoot)
-        WebInspector.uninstallComponentRootStyles(this);
-    return result;
-}
-
-/**
  * @param {!Event} event
  * @return {boolean}
  */