DevTools: Add JSDoc for static methods, fix JSDoc types and induced errors

Source/devtools/front_end/profiler/CPUProfileFlameChart.js

 /**
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 253 matching lines @@
             this._font = (this.barHeight() - 4) + "px " + WebInspector.fontFamily();
             this._boldFont = "bold " + this._font;
         }
         var node = this._entryNodes[entryIndex];
         var reason = node.deoptReason;
         return (reason && reason !== "no reason") ? this._boldFont : this._font;
     },
 
     /**
      * @param {number} entryIndex
-     * @return {!string}
+     * @return {string}
      */
     entryColor: function(entryIndex)
     {
         var node = this._entryNodes[entryIndex];
         return this._colorGenerator.colorForID(node.functionName + ":" + node.url);
     },
 
     /**
      * @param {number} entryIndex
      * @param {!CanvasRenderingContext2D} context
@@ skipping 35 matching lines @@
     /**
      * @return {number}
      */
     paddingLeft: function()
     {
         return 15;
     },
 
     /**
      * @param {number} entryIndex
-     * @return {!string}
+     * @return {string}
      */
     textColor: function(entryIndex)
     {
         return "#333";
     }
 }
 
 
 /**
  * @return {!WebInspector.FlameChart.ColorGenerator}
@@ skipping 300 matching lines @@
     {
         var ratio = window.devicePixelRatio;
         this._overviewCanvas.width = width * ratio;
         this._overviewCanvas.height = height * ratio;
         this._overviewCanvas.style.width = width + "px";
         this._overviewCanvas.style.height = height + "px";
     },
 
     __proto__: WebInspector.VBox.prototype
 }