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

extensions/renderer/user_script_injector.cc

Index: extensions/renderer/user_script_injector.cc
diff --git a/extensions/renderer/user_script_injector.cc b/extensions/renderer/user_script_injector.cc
index 73096868c94a4ff48f6e31aa2bc40e8e56b3a675..bd662fb7edc34a86b85a8641aa49ac79cda6d2f4 100644
--- a/extensions/renderer/user_script_injector.cc
+++ b/extensions/renderer/user_script_injector.cc
@@ -84,7 +84,7 @@ bool ShouldInjectScripts(const UserScript::FileList& scripts,
                          const std::set<std::string>& injected_files) {
   for (const std::unique_ptr<UserScript::File>& file : scripts) {
     // Check if the script is already injected.
-    if (injected_files.count(file->url().path()) == 0) {
+    if (injected_files.count(file->url().path().as_string()) == 0) {
       return true;
     }
   }
@@ -227,7 +227,7 @@ std::vector<blink::WebScriptSource> UserScriptInjector::GetJsSources(
   for (const std::unique_ptr<UserScript::File>& file : js_scripts) {
     const GURL& script_url = file->url();
     // Check if the script is already injected.
-    if (executing_scripts->count(script_url.path()) != 0)
+    if (executing_scripts->count(script_url.path().as_string()) != 0)
       continue;
 
     sources.push_back(blink::WebScriptSource(
@@ -235,7 +235,7 @@ std::vector<blink::WebScriptSource> UserScriptInjector::GetJsSources(
         script_url));
 
     (*num_injected_js_scripts) += 1;
-    executing_scripts->insert(script_url.path());
+    executing_scripts->insert(script_url.path().as_string());
   }
 
   return sources;
@@ -253,7 +253,7 @@ std::vector<blink::WebString> UserScriptInjector::GetCssSources(
   const UserScript::FileList& css_scripts = script_->css_scripts();
   sources.reserve(css_scripts.size());
   for (const std::unique_ptr<UserScript::File>& file : script_->css_scripts()) {
-    const std::string& stylesheet_path = file->url().path();
+    const std::string& stylesheet_path = file->url().path().as_string();
     // Check if the stylesheet is already injected.
     if (injected_stylesheets->count(stylesheet_path) != 0)
       continue;