[WIP] make GURL::path() return a StringPiece

net/url_request/sdch_dictionary_fetcher_unittest.cc

Index: net/url_request/sdch_dictionary_fetcher_unittest.cc
diff --git a/net/url_request/sdch_dictionary_fetcher_unittest.cc b/net/url_request/sdch_dictionary_fetcher_unittest.cc
index 2b1f2d36e11276cf43b8e9ac35d9cc02ec39ea36..1aec0c59945381b6c8cbfa8ecc9832d3cf71bd31 100644
--- a/net/url_request/sdch_dictionary_fetcher_unittest.cc
+++ b/net/url_request/sdch_dictionary_fetcher_unittest.cc
@@ -168,10 +168,11 @@ class SDCHTestRequestInterceptor : public URLRequestInterceptor {
       NetworkDelegate* network_delegate) const override {
     lifecycle_callback_.Run(1, 0);
 
-    std::string path = request->url().path();
+    base::StringPiece path = request->url().path();
     if (base::StartsWith(path, kRedirectPath, base::CompareCase::SENSITIVE)) {
       return new TestURLRequestRedirectJob(
-          request, network_delegate, GURL(path.substr(strlen(kRedirectPath))),
+          request, network_delegate,
+          GURL(path.substr(strlen(kRedirectPath)).as_string()),
           URLRequestRedirectJob::REDIRECT_307_TEMPORARY_REDIRECT, "testing",
           base::Bind(lifecycle_callback_, -1, 0));
     }