DevTools: Get rid of WebInspector.TargetObserver

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 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 
 /**
  * @constructor
  * @implements {WebInspector.FlameChartDataProvider}
  * @param {!WebInspector.CPUProfileDataModel} cpuProfile
- * @param {?WebInspector.Target} target
+ * @param {!WeakReference.<!WebInspector.Target>} weakTarget
  */
-WebInspector.CPUFlameChartDataProvider = function(cpuProfile, target)
+WebInspector.CPUFlameChartDataProvider = function(cpuProfile, weakTarget)
 {
     WebInspector.FlameChartDataProvider.call(this);
     this._cpuProfile = cpuProfile;
-    this._targetObserver = new WebInspector.TargetObserver(target);
+    this._weakTarget = weakTarget;
     this._colorGenerator = WebInspector.CPUFlameChartDataProvider.colorGenerator();
 }
 
 WebInspector.CPUFlameChartDataProvider.prototype = {
     /**
      * @return {number}
      */
     barHeight: function()
     {
         return 15;
@@ skipping 164 matching lines @@
             row.title = title;
             row.text = text;
             entryInfo.push(row);
         }
 
         pushEntryInfoRow(WebInspector.UIString("Name"), node.functionName);
         var selfTime = this._millisecondsToString(this._entrySelfTimes[entryIndex]);
         var totalTime = this._millisecondsToString(timelineData.entryTotalTimes[entryIndex]);
         pushEntryInfoRow(WebInspector.UIString("Self time"), selfTime);
         pushEntryInfoRow(WebInspector.UIString("Total time"), totalTime);
-        var target = this._targetObserver.target();
+        var target = this._weakTarget.get();
         var text = target ? WebInspector.Linkifier.liveLocationText(target, node.scriptId, node.lineNumber, node.columnNumber) : node.url;
         pushEntryInfoRow(WebInspector.UIString("URL"), text);
         pushEntryInfoRow(WebInspector.UIString("Aggregated self time"), Number.secondsToString(node.selfTime / 1000, true));
         pushEntryInfoRow(WebInspector.UIString("Aggregated total time"), Number.secondsToString(node.totalTime / 1000, true));
         if (node.deoptReason && node.deoptReason !== "no reason")
             pushEntryInfoRow(WebInspector.UIString("Not optimized"), node.deoptReason);
 
         return entryInfo;
     },
 
@@ skipping 403 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
 }