extensions: Cleanup class/struct fwd declarations

extensions/renderer/script_injector.h

Index: extensions/renderer/script_injector.h
diff --git a/extensions/renderer/script_injector.h b/extensions/renderer/script_injector.h
index 38c072de206c4bbe7e9807eac40845d1b4b4420e..cc0362480e46c2af8ea61bcbb64a5af836953099 100644
--- a/extensions/renderer/script_injector.h
+++ b/extensions/renderer/script_injector.h
@@ -12,7 +12,6 @@
 #include "extensions/common/user_script.h"
 #include "third_party/WebKit/public/web/WebScriptSource.h"
 
-class GURL;
 class InjectionHost;
 
 namespace blink {
@@ -20,7 +19,6 @@ class WebLocalFrame;
 }
 
 namespace extensions {
-struct ScriptsRunInfo;
 
 // The pseudo-delegate class for a ScriptInjection that provides all necessary
 // information about how to inject the script, including what code to inject,