[DevTools] Extract platform module.

Source/devtools/front_end/platform/DOMExtension.js

Index: Source/devtools/front_end/platform/DOMExtension.js
diff --git a/Source/devtools/front_end/host/DOMExtension.js b/Source/devtools/front_end/platform/DOMExtension.js
similarity index 90%
rename from Source/devtools/front_end/host/DOMExtension.js
rename to Source/devtools/front_end/platform/DOMExtension.js
index d22335c4777ef27c3f659ffc6382fc54088221e7..d16df0767c6d9fc5e6d1bbfbc617663cf16e06e4 100644
--- a/Source/devtools/front_end/host/DOMExtension.js
+++ b/Source/devtools/front_end/platform/DOMExtension.js
@@ -203,80 +203,6 @@ function removeSubsequentNodes(fromNode, toNode)
 }
 
 /**
- * @constructor
- * @param {!Size} minimum
- * @param {?Size=} preferred
- */
-function Constraints(minimum, preferred)
-{
-    /**
-     * @type {!Size}
-     */
-    this.minimum = minimum;
-
-    /**
-     * @type {!Size}
-     */
-    this.preferred = preferred || minimum;
-
-    if (this.minimum.width > this.preferred.width || this.minimum.height > this.preferred.height)
-        throw new Error("Minimum size is greater than preferred.");
-}
-
-/**
- * @param {?Constraints} constraints
- * @return {boolean}
- */
-Constraints.prototype.isEqual = function(constraints)
-{
-    return !!constraints && this.minimum.isEqual(constraints.minimum) && this.preferred.isEqual(constraints.preferred);
-}
-
-/**
- * @param {!Constraints|number} value
- * @return {!Constraints}
- */
-Constraints.prototype.widthToMax = function(value)
-{
-    if (typeof value === "number")
-        return new Constraints(this.minimum.widthToMax(value), this.preferred.widthToMax(value));
-    return new Constraints(this.minimum.widthToMax(value.minimum), this.preferred.widthToMax(value.preferred));
-}
-
-/**
- * @param {!Constraints|number} value
- * @return {!Constraints}
- */
-Constraints.prototype.addWidth = function(value)
-{
-    if (typeof value === "number")
-        return new Constraints(this.minimum.addWidth(value), this.preferred.addWidth(value));
-    return new Constraints(this.minimum.addWidth(value.minimum), this.preferred.addWidth(value.preferred));
-}
-
-/**
- * @param {!Constraints|number} value
- * @return {!Constraints}
- */
-Constraints.prototype.heightToMax = function(value)
-{
-    if (typeof value === "number")
-        return new Constraints(this.minimum.heightToMax(value), this.preferred.heightToMax(value));
-    return new Constraints(this.minimum.heightToMax(value.minimum), this.preferred.heightToMax(value.preferred));
-}
-
-/**
- * @param {!Constraints|number} value
- * @return {!Constraints}
- */
-Constraints.prototype.addHeight = function(value)
-{
-    if (typeof value === "number")
-        return new Constraints(this.minimum.addHeight(value), this.preferred.addHeight(value));
-    return new Constraints(this.minimum.addHeight(value.minimum), this.preferred.addHeight(value.preferred));
-}
-
-/**
  * @param {!Event} event
  * @return {boolean}
  */