Attempt to fix hanging WebRequestBlocking.

chrome/test/data/extensions/api_test/webrequest/framework.js

 var getURL = chrome.extension.getURL;
 var deepEq = chrome.test.checkDeepEq;
 var expectedEventData;
 var capturedEventData;
 var expectedEventOrder;
 var tabId;
 var testServerPort;
 var eventsCaptured;
 
 function runTests(tests) {
@@ skipping 97 matching lines @@
 // an expected value. This is a basic check that the request headers are valid.
 function checkUserAgent(headers) {
   for (var i in headers) {
     if (headers[i].name.toLowerCase() == "user-agent")
       return headers[i].value.toLowerCase().indexOf("chrome") != -1;
   }
   return false;
 }
 
 function captureEvent(name, details) {
+  console.log("capture " + name + ": " + details.url);
   // Ignore system-level requests like safebrowsing updates and favicon fetches
   // since they are unpredictable.
   if (details.tabId == -1 || details.type == "other" ||
       details.url.match(/\/favicon.ico$/) ||
       details.url.match(/https:\/\/dl.google.com/))
     return;
 
   // Pull the extra per-event options out of the expected data. These let
   // us specify special return values per event.
   var currentIndex = capturedEventData.length;
@@ skipping 105 matching lines @@
   }
   helper(chrome.experimental.webRequest.onBeforeRequest);
   helper(chrome.experimental.webRequest.onBeforeSendHeaders);
   helper(chrome.experimental.webRequest.onAuthRequired);
   helper(chrome.experimental.webRequest.onSendHeaders);
   helper(chrome.experimental.webRequest.onResponseStarted);
   helper(chrome.experimental.webRequest.onBeforeRedirect);
   helper(chrome.experimental.webRequest.onCompleted);
   helper(chrome.experimental.webRequest.onErrorOccurred);
 }