[DevTools] Remove Common.Event.target field.

third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js

Index: third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js b/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
index fc305dd5e414cc5e5ea9690f1f5b449b288b1b78..b373530ba02943e58f2f9cc12dd555a28fd168cb 100644
--- a/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sources/SourcesPanel.js
@@ -111,9 +111,11 @@ Sources.SourcesPanel = class extends UI.Panel {
     SDK.targetManager.addModelListener(
         SDK.DebuggerModel, SDK.DebuggerModel.Events.DebuggerPaused, this._debuggerPaused, this);
     SDK.targetManager.addModelListener(
-        SDK.DebuggerModel, SDK.DebuggerModel.Events.DebuggerResumed, this._debuggerResumed, this);
+        SDK.DebuggerModel, SDK.DebuggerModel.Events.DebuggerResumed,
+        (event) => this._debuggerResumed(/** @type {!SDK.DebuggerModel} */ (event.data)));
     SDK.targetManager.addModelListener(
-        SDK.DebuggerModel, SDK.DebuggerModel.Events.GlobalObjectCleared, this._debuggerReset, this);
+        SDK.DebuggerModel, SDK.DebuggerModel.Events.GlobalObjectCleared,
+        (event) => this._debuggerResumed(/** @type {!SDK.DebuggerModel} */ (event.data)));
     SDK.targetManager.addModelListener(
         SDK.SubTargetsManager, SDK.SubTargetsManager.Events.PendingTargetAdded, this._pendingTargetAdded, this);
     new Sources.WorkspaceMappingTip(this, this._workspace);
@@ -288,7 +290,8 @@ Sources.SourcesPanel = class extends UI.Panel {
    * @param {!Common.Event} event
    */
   _debuggerPaused(event) {
-    var details = /** @type {!SDK.DebuggerPausedDetails} */ (event.data);
+    var debuggerModel = /** @type {!SDK.DebuggerModel} */ (event.data);
+    var details = debuggerModel.debuggerPausedDetails();
     if (!this._paused)
       this._setAsCurrentPanel();
 
@@ -312,10 +315,9 @@ Sources.SourcesPanel = class extends UI.Panel {
   }
 
   /**
-   * @param {!Common.Event} event
+   * @param {!SDK.DebuggerModel} debuggerModel
    */
-  _debuggerResumed(event) {
-    var debuggerModel = /** @type {!SDK.DebuggerModel} */ (event.target);
+  _debuggerResumed(debuggerModel) {
     var target = debuggerModel.target();
     if (UI.context.flavor(SDK.Target) !== target)
       return;
@@ -329,21 +331,14 @@ Sources.SourcesPanel = class extends UI.Panel {
    * @param {!Common.Event} event
    */
   _debuggerWasEnabled(event) {
-    var target = /** @type {!SDK.Target} */ (event.target.target());
-    if (UI.context.flavor(SDK.Target) !== target)
+    var debuggerModel = /** @type {!SDK.DebuggerModel} */ (event.data);
+    if (UI.context.flavor(SDK.Target) !== debuggerModel.target())
       return;
 
     this._updateDebuggerButtonsAndStatus();
   }
 
   /**
-   * @param {!Common.Event} event
-   */
-  _debuggerReset(event) {
-    this._debuggerResumed(event);
-  }
-
-  /**
    * @return {?UI.Widget}
    */
   get visibleView() {