DevTools: proper management of ResourceTreeModel in NetworkProject

third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js

Index: third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
index 95e20682336f8f7ed6e94b3884def3a53260c3ce..c31e38de0eb1ab5115d48ef41c08ce47b8f3f690 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/ResourceTreeModel.js
@@ -28,9 +28,6 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-/**
- * @unrestricted
- */
 SDK.ResourceTreeModel = class extends SDK.SDKModel {
   /**
    * @param {!SDK.Target} target
@@ -44,18 +41,21 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
       networkManager.addEventListener(
           SDK.NetworkManager.Events.RequestUpdateDropped, this._onRequestUpdateDropped, this);
     }
-
     this._agent = target.pageAgent();
     this._agent.enable();
     this._securityOriginManager = target.model(SDK.SecurityOriginManager);
 
-    this._fetchResourceTree();
-
     target.registerPageDispatcher(new SDK.PageDispatcher(this));
 
+    /** @type {!Map<string, !SDK.ResourceTreeFrame>} */
+    this._frames = new Map();
+    this._cachedResourcesProcessed = false;
     this._pendingReloadOptions = null;
     this._reloadSuspensionCount = 0;
     this._isInterstitialShowing = false;
+    this.mainFrame = null;
+
+    this._fetchResourceTree();
   }
 
   /**
@@ -101,7 +101,6 @@ SDK.ResourceTreeModel = class extends SDK.SDKModel {
   }
 
   _fetchResourceTree() {
-    /** @type {!Map<string, !SDK.ResourceTreeFrame>} */
     this._frames = new Map();
     this._cachedResourcesProcessed = false;
     this._agent.getResourceTree(this._processCachedResources.bind(this));