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

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 065057e7ea6ccc998d2e63b341e8fd9f2cbf0e31..33f8dc04212bdd2ddc0dce915c31da946fb40887 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -463,16 +463,16 @@ bool RemoveUberHost(GURL* url) {
   if (url->path().empty() || url->path() == "/")
     return false;
 
-  const std::string old_path = url->path();
+  const base::StringPiece old_path = url->path();
 
   const std::string::size_type separator = old_path.find('/', 1);
   std::string new_host;
   std::string new_path;
   if (separator == std::string::npos) {
-    new_host = old_path.substr(1);
+    new_host = old_path.substr(1).as_string();
   } else {
-    new_host = old_path.substr(1, separator - 1);
-    new_path = old_path.substr(separator);
+    new_host = old_path.substr(1, separator - 1).as_string();
+    new_path = old_path.substr(separator).as_string();
   }
 
   // Do not allow URLs with paths empty before the first slash since we can't