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

components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc

Index: components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
diff --git a/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc b/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
index 57bd1de7c13068b7955ce5f5b43c4f3dc3801fe5..df14c1c7ff19d87e25cf5a95e21279da293db648 100644
--- a/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
+++ b/components/subresource_filter/content/browser/content_subresource_filter_driver_factory.cc
@@ -76,7 +76,8 @@ bool ContentSubresourceFilterDriverFactory::IsWhitelisted(
 }
 
 bool ContentSubresourceFilterDriverFactory::IsHit(const GURL& url) const {
-  return safe_browsing_blacklisted_patterns_.find(url.host() + url.path()) !=
+  return safe_browsing_blacklisted_patterns_.find(url.host() +
+                                                  url.path().as_string()) !=
          safe_browsing_blacklisted_patterns_.end();
 }
 
@@ -109,8 +110,10 @@ void ContentSubresourceFilterDriverFactory::AddHostOfURLToWhitelistSet(
 
 void ContentSubresourceFilterDriverFactory::AddToActivationHitsSet(
     const GURL& url) {
-  if (!url.host().empty() && url.SchemeIsHTTPOrHTTPS())
-    safe_browsing_blacklisted_patterns_.insert(url.host() + url.path());
+  if (!url.host().empty() && url.SchemeIsHTTPOrHTTPS()) {
+    safe_browsing_blacklisted_patterns_.insert(url.host() +
+                                               url.path().as_string());
+  }
 }
 
 bool ContentSubresourceFilterDriverFactory::ShouldActivateForMainFrameURL(