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

chrome/browser/chrome_switches_browsertest.cc

Index: chrome/browser/chrome_switches_browsertest.cc
diff --git a/chrome/browser/chrome_switches_browsertest.cc b/chrome/browser/chrome_switches_browsertest.cc
index a390a99ce8ff10272e0df0161772a10ab266ab61..46627b999f048e5a6afa10b8965d0640405939a3 100644
--- a/chrome/browser/chrome_switches_browsertest.cc
+++ b/chrome/browser/chrome_switches_browsertest.cc
@@ -36,7 +36,8 @@ class HostRulesTest : public InProcessBrowserTest {
 IN_PROC_BROWSER_TEST_F(HostRulesTest, TestMap) {
   // Go to the empty page using www.google.com as the host.
   GURL local_url = embedded_test_server()->GetURL("/empty.html");
-  GURL test_url(std::string("http://www.google.com") + local_url.path());
+  GURL test_url(std::string("http://www.google.com") +
+                local_url.path().as_string());
   ui_test_utils::NavigateToURL(browser(), test_url);
 
   std::string html;