Revert of Make profiling lock global rather than per Target

Source/devtools/front_end/profiler/ProfilesPanel.js

Index: Source/devtools/front_end/profiler/ProfilesPanel.js
diff --git a/Source/devtools/front_end/profiler/ProfilesPanel.js b/Source/devtools/front_end/profiler/ProfilesPanel.js
index 44dd77b7ee2425cbda916e7ccc53a3ebf259cdf3..81f16168e936236e9b45937c5238994d52ddb060 100644
--- a/Source/devtools/front_end/profiler/ProfilesPanel.js
+++ b/Source/devtools/front_end/profiler/ProfilesPanel.js
@@ -238,9 +238,9 @@
     setProfileBeingRecorded: function(profile)
     {
         if (this._profileBeingRecorded && this._profileBeingRecorded.target())
-            WebInspector.profilingLock.release();
+            this._profileBeingRecorded.target().profilingLock.release();
         if (profile && profile.target())
-            WebInspector.profilingLock.acquire();
+            profile.target().profilingLock.acquire();
         this._profileBeingRecorded = profile;
     },
 
@@ -440,6 +440,7 @@
  * @constructor
  * @implements {WebInspector.Searchable}
  * @implements {WebInspector.ProfileType.DataDisplayDelegate}
+ * @implements {WebInspector.TargetManager.Observer}
  * @extends {WebInspector.PanelWithSidebarTree}
  */
 WebInspector.ProfilesPanel = function()
@@ -500,10 +501,26 @@
     this.element.addEventListener("contextmenu", this._handleContextMenuEvent.bind(this), true);
     this._registerShortcuts();
 
-    WebInspector.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
+    WebInspector.targetManager.observeTargets(this);
 }
 
 WebInspector.ProfilesPanel.prototype = {
+    /**
+     * @param {!WebInspector.Target} target
+     */
+    targetAdded: function(target)
+    {
+        target.profilingLock.addEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
+    },
+
+    /**
+     * @param {!WebInspector.Target} target
+     */
+    targetRemoved: function(target)
+    {
+        target.profilingLock.removeEventListener(WebInspector.Lock.Events.StateChanged, this._onProfilingStateChanged, this);
+    },
+
     /**
      * @return {!WebInspector.SearchableView}
      */
@@ -600,7 +617,7 @@
     {
         if (WebInspector.experimentsSettings.disableAgentsWhenProfile.isEnabled())
             WebInspector.inspectorView.setCurrentPanelLocked(toggled);
-        var isAcquiredInSomeTarget = WebInspector.profilingLock.isAcquired();
+        var isAcquiredInSomeTarget = WebInspector.targetManager.targets().some(function(target) { return target.profilingLock.isAcquired(); });
         var enable = toggled || !isAcquiredInSomeTarget;
         this.recordButton.setEnabled(enable);
         this.recordButton.toggled = toggled;