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

chrome/browser/importer/profile_writer.cc

Index: chrome/browser/importer/profile_writer.cc
diff --git a/chrome/browser/importer/profile_writer.cc b/chrome/browser/importer/profile_writer.cc
index 1d5ee8087f4bbc895a6f0aca8fc661ad87eefd25..d106b30c90ee53c3287cb555a38bc547b696ead4 100644
--- a/chrome/browser/importer/profile_writer.cc
+++ b/chrome/browser/importer/profile_writer.cc
@@ -259,7 +259,7 @@ typedef std::map<std::string, TemplateURL*> HostPathMap;
 // Returns the key for the map built by BuildHostPathMap. If url_string is not
 // a valid URL, an empty string is returned, otherwise host+path is returned.
 static std::string HostPathKeyForURL(const GURL& url) {
-  return url.is_valid() ? url.host() + url.path() : std::string();
+  return url.is_valid() ? url.host() + url.path().as_string() : std::string();
 }
 
 // Builds the key to use in HostPathMap for the specified TemplateURL. Returns