Add operator==(const GURL&, const StringPiece&) to gurl.h

extensions/renderer/script_injection_manager.cc

Index: extensions/renderer/script_injection_manager.cc
diff --git a/extensions/renderer/script_injection_manager.cc b/extensions/renderer/script_injection_manager.cc
index 3b6bc305484683f7d116d98aeda9568a9dc3d555..19c356f4c2b57eaca8d77d04c09092848b3bf335 100644
--- a/extensions/renderer/script_injection_manager.cc
+++ b/extensions/renderer/script_injection_manager.cc
@@ -218,7 +218,7 @@ void ScriptInjectionManager::RFOHelper::OnExecuteDeclarativeScript(
   // TODO(markdittmer): URL-checking isn't the best security measure.
   // Begin script injection workflow only if the current URL is identical to
   // the one that matched declarative conditions in the browser.
-  if (render_frame()->GetWebFrame()->document().url() == url) {
+  if (GURL(render_frame()->GetWebFrame()->document().url()) == url) {
     manager_->HandleExecuteDeclarativeScript(render_frame(),
                                              tab_id,
                                              extension_id,