[Devtools] Fixed frontend to properly support optional requestWillBeSent

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

Index: third_party/WebKit/Source/devtools/front_end/sdk/NetworkManager.js
diff --git a/third_party/WebKit/Source/devtools/front_end/sdk/NetworkManager.js b/third_party/WebKit/Source/devtools/front_end/sdk/NetworkManager.js
index 52fd74b24b8e8d6748e01cd5d76edb4b0ab0d2b8..00d33612413f1f918d3e458b4952da6d6120e6e9 100644
--- a/third_party/WebKit/Source/devtools/front_end/sdk/NetworkManager.js
+++ b/third_party/WebKit/Source/devtools/front_end/sdk/NetworkManager.js
@@ -326,7 +326,8 @@ SDK.NetworkDispatcher = class {
     networkRequest.hasNetworkData = true;
     this._updateNetworkRequestWithRequest(networkRequest, request);
     networkRequest.setIssueTime(time, wallTime);
-    networkRequest.setResourceType(Common.resourceTypes[resourceType]);
+    networkRequest.setResourceType(
+        resourceType ? Common.resourceTypes[resourceType] : Protocol.Page.ResourceType.Other);
 
     this._startNetworkRequest(networkRequest);
   }