Fix Request Interception (#565)

It turned out that either Network.requestIntercepted or
Network.requestWillBeSent occasionally report encoded URL.

This patch starts decoding URL's when generating request hash.

Fixes #558.

lib/NetworkManager.js

@@ -340,7 +340,8 @@ helper.tracePublicAPI(Response);
  */
 function generateRequestHash(request) {
   const hash = {
-    url: request.url,
+    // Decoding is necessary to normalize URLs. @see crbug.com/759388
+    url: decodeURI(request.url),
     method: request.method,
     postData: request.postData,
     headers: {},