Refactoring: de-couple Extensions from "script injection System" [render side]:3

extensions/renderer/injection_host.h

Index: extensions/renderer/injection_host.h
diff --git a/extensions/renderer/injection_host.h b/extensions/renderer/injection_host.h
index 6c23c2d3cd2cab7c7bdb9e87665c18e283eea452..4dcb225f2aedd8a644c1203a61f22e91c1fad91c 100644
--- a/extensions/renderer/injection_host.h
+++ b/extensions/renderer/injection_host.h
@@ -15,7 +15,7 @@ class InjectionHost {
   InjectionHost(const HostID& host_id);
   virtual ~InjectionHost();
 
-  virtual const std::string& GetContentSecurityPolicy() const = 0;
+  virtual std::string GetContentSecurityPolicy() const = 0;
 
   // The base url for the host.
   virtual const GURL& url() const = 0;
@@ -35,6 +35,7 @@ class InjectionHost {
   virtual bool ShouldNotifyBrowserOfInjection() const = 0;
 
   const HostID& id() const { return id_; }
+
  private:
   // The ID of the host.
   HostID id_;