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

content/common/plugin_list.cc

Index: content/common/plugin_list.cc
diff --git a/content/common/plugin_list.cc b/content/common/plugin_list.cc
index 9d650aac1d16b20a717318eb0437cd73c907c3af..a63cb731fda805ce72876e897ee0b09443df98d7 100644
--- a/content/common/plugin_list.cc
+++ b/content/common/plugin_list.cc
@@ -236,11 +236,10 @@ void PluginList::GetPluginInfoArray(
   // We collected stats to determine this approach isn't a major compat issue,
   // and we defend against content confusion attacks in various cases, such
   // as when the user doesn't have the Flash plugin enabled.
-  std::string path = url.path();
+  base::StringPiece path = url.path();
   std::string::size_type last_dot = path.rfind('.');
   if (last_dot != std::string::npos && mime_type.empty()) {
-    std::string extension =
-        base::ToLowerASCII(base::StringPiece(path).substr(last_dot + 1));
+    std::string extension = base::ToLowerASCII(path.substr(last_dot + 1));
     std::string actual_mime_type;
     for (size_t i = 0; i < plugins_list_.size(); ++i) {
       if (SupportsExtension(plugins_list_[i], extension, &actual_mime_type)) {