Enable <webview>.executeScript outside of Apps and Extensions [1]

extensions/renderer/extension_injection_host.h

Index: extensions/renderer/extension_injection_host.h
diff --git a/extensions/renderer/extension_injection_host.h b/extensions/renderer/extension_injection_host.h
index 2806bb2e23197fe63edb8139f9f4667869488ae0..0c67993a299058f6c9e01dc15c372c31ecd220c8 100644
--- a/extensions/renderer/extension_injection_host.h
+++ b/extensions/renderer/extension_injection_host.h
@@ -12,6 +12,8 @@
 namespace extensions {
 class ExtensionSet;
 
+class ExtensionSet;
+
 // A wrapper class that holds an extension and implements the InjectionHost
 // interface.
 class ExtensionInjectionHost : public InjectionHost {
@@ -19,8 +21,8 @@ class ExtensionInjectionHost : public InjectionHost {
   ExtensionInjectionHost(const Extension* extension);
   ~ExtensionInjectionHost() override;
 
-  static scoped_ptr<const ExtensionInjectionHost> Create(
-      const std::string& extension_id, const ExtensionSet* extensions);
+  static scoped_ptr<const InjectionHost> Create(const std::string& extension_id,
+                                                const ExtensionSet* extensions);
 
  private:
   // InjectionHost: