Revert of DevTools: Add inertia to flamechart dragging.

third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js

Index: third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
diff --git a/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js b/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
index 41fed7a70e127907510fd9f782b7e3c5ec5c3109..cbe69e3c758bfc10100bda4ce8c597f1c6107c45 100644
--- a/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
+++ b/third_party/WebKit/Source/devtools/front_end/ui/UIUtils.js
@@ -197,80 +197,6 @@
 }
 
 /**
- * @param {!Element} element
- * @param {function(number, number, !MouseEvent): boolean} elementDragStart
- * @param {function(number, number)} elementDrag
- * @param {function(number, number)} elementDragEnd
- * @param {string} cursor
- * @param {?string=} hoverCursor
- * @param {number=} startDelay
- * @param {number=} friction
- */
-WebInspector.installInertialDragHandle = function(element, elementDragStart, elementDrag, elementDragEnd, cursor, hoverCursor, startDelay, friction)
-{
-    WebInspector.installDragHandle(element, drag.bind(null, elementDragStart), drag.bind(null, elementDrag), dragEnd, cursor, hoverCursor, startDelay);
-    if (typeof friction !== "number")
-        friction = 50;
-    var lastX;
-    var lastY;
-    var lastTime;
-    var velocityX;
-    var velocityY;
-    var holding = false;
-
-    /**
-     * @param {function(number, number, !MouseEvent): boolean} callback
-     * @param {!MouseEvent} event
-     * @return {boolean}
-     */
-    function drag(callback, event)
-    {
-        lastTime = window.performance.now();
-        lastX = event.pageX;
-        lastY = event.pageY;
-        holding = true;
-        return callback(lastX, lastY, event);
-    }
-
-    /**
-     * @param {!MouseEvent} event
-     */
-    function dragEnd(event)
-    {
-        var now = window.performance.now();
-        var maxVelocity = 4; // 4px per millisecond.
-        var duration = now - lastTime || 1;
-        velocityX = Number.constrain((event.pageX - lastX) / duration, -maxVelocity, maxVelocity);
-        velocityY = Number.constrain((event.pageY - lastY) / duration, -maxVelocity, maxVelocity);
-        lastX = event.pageX;
-        lastY = event.pageY;
-        lastTime = now;
-        holding = false;
-        elementDrag(lastX, lastY);
-        element.window().requestAnimationFrame(animationStep);
-    }
-
-    function animationStep()
-    {
-        var v2 = velocityX * velocityX + velocityY * velocityY;
-        if (v2 < 0.001 || holding) {
-            elementDragEnd(lastX, lastY);
-            return;
-        }
-        var now = window.performance.now();
-        var duration = now - lastTime || 1;
-        element.window().requestAnimationFrame(animationStep);
-        lastTime = now;
-        lastX += velocityX * duration;
-        lastY += velocityY * duration;
-        var k = Math.pow(1 / (1 + friction), duration / 1000);
-        velocityX *= k;
-        velocityY *= k;
-        elementDrag(lastX, lastY);
-    }
-}
-
-/**
  * @constructor
  * @param {!Document} document
  * @param {boolean=} dimmed