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

extensions/browser/extension_navigation_throttle.cc

Index: extensions/browser/extension_navigation_throttle.cc
diff --git a/extensions/browser/extension_navigation_throttle.cc b/extensions/browser/extension_navigation_throttle.cc
index 68c0a92e340da9750e1fcff31bd267476f9f0e00..1455a926bb118a1dfae03462f0c31eaf84caea8a 100644
--- a/extensions/browser/extension_navigation_throttle.cc
+++ b/extensions/browser/extension_navigation_throttle.cc
@@ -80,7 +80,7 @@ ExtensionNavigationThrottle::WillStartRequest() {
 
         std::string partition_domain, partition_id;
         bool in_memory;
-        std::string resource_path = url.path();
+        std::string resource_path = url.path().as_string();
         bool is_guest = WebViewGuest::GetGuestPartitionConfigForSite(
             navigation_handle()->GetStartingSiteInstance()->GetSiteURL(),
             &partition_domain, &partition_id, &in_memory);
@@ -143,7 +143,7 @@ ExtensionNavigationThrottle::WillStartRequest() {
 
   // Since there was at least one origin different than the navigation URL,
   // explicitly check for the resource in web_accessible_resources.
-  std::string resource_path = url.path();
+  base::StringPiece resource_path = url.path();
   if (!registry)
     return content::NavigationThrottle::BLOCK_REQUEST;
 
@@ -152,8 +152,8 @@ ExtensionNavigationThrottle::WillStartRequest() {
   if (!extension)
     return content::NavigationThrottle::BLOCK_REQUEST;
 
-  if (WebAccessibleResourcesInfo::IsResourceWebAccessible(extension,
-                                                          resource_path)) {
+  if (WebAccessibleResourcesInfo::IsResourceWebAccessible(
+          extension, resource_path.as_string())) {
     return content::NavigationThrottle::PROCEED;
   }