[Devtools] Fixed bug with NetworkLog depending on ResourceTreeModel

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
index 09497a0d88bbf727dc145beb63db599c0d2db6e3..07f2a6a170f3ae84718c2e217ff063ce86b60768 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/TargetManager.js
@@ -176,8 +176,9 @@ SDK.TargetManager = class extends Common.Object {
     if (networkManager && target.hasDOMCapability()) {
       resourceTreeModel =
           new SDK.ResourceTreeModel(target, networkManager, SDK.SecurityOriginManager.fromTarget(target));
-      new SDK.NetworkLog(target, resourceTreeModel, networkManager);
     }
+    if (networkManager)
+      new SDK.NetworkLog(target, resourceTreeModel, networkManager);
 
     /** @type {!SDK.RuntimeModel} */
     target.runtimeModel = new SDK.RuntimeModel(target);