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

extensions/browser/info_map.cc

Index: extensions/browser/info_map.cc
diff --git a/extensions/browser/info_map.cc b/extensions/browser/info_map.cc
index c97832ca4b29d8d86b1bff953726ab4a9c272c65..96558dc97a987039376095602c62525395b2e758 100644
--- a/extensions/browser/info_map.cc
+++ b/extensions/browser/info_map.cc
@@ -167,7 +167,7 @@ bool InfoMap::MapUrlToLocalFilePath(const GURL& file_url,
   // handles a subset of the urls.
   if (!use_blocking_api) {
     if (file_url.SchemeIs(extensions::kExtensionScheme)) {
-      std::string path = file_url.path();
+      std::string path = file_url.path().as_string();
       base::TrimString(path, "/", &path);  // Remove first slash
       *file_path = extension->path().AppendASCII(path);
       return true;
@@ -175,7 +175,7 @@ bool InfoMap::MapUrlToLocalFilePath(const GURL& file_url,
     return false;
   }
 
-  std::string path = file_url.path();
+  std::string path = file_url.path().as_string();
   ExtensionResource resource;
 
   if (SharedModuleInfo::IsImportedPath(path)) {