Remove a chrome dependency by removing Prerender from ResourceDispatcherHost.

content/browser/renderer_host/resource_dispatcher_host.h

Index: content/browser/renderer_host/resource_dispatcher_host.h
diff --git a/content/browser/renderer_host/resource_dispatcher_host.h b/content/browser/renderer_host/resource_dispatcher_host.h
index f8643fed4056f0b05256172c29875ca7d7ad1927..b16896a33289f1566d913504386ddf991233a58c 100644
--- a/content/browser/renderer_host/resource_dispatcher_host.h
+++ b/content/browser/renderer_host/resource_dispatcher_host.h
@@ -59,6 +59,20 @@ class DeletableFileReference;
 
 class ResourceDispatcherHost : public net::URLRequest::Delegate {
  public:
+  class Observer {
+   public:
+    virtual bool ShouldBeginRequest(int child_id, int route_id,

[cbentzel, 2011/05/24 17:13:54]

Please document these methods.

[dominich, 2011/05/24 18:01:47]

Done.

+        const ResourceHostMsg_Request& request_data,
+        const content::ResourceContext& resource_context,
+        const GURL& referrer) = 0;
+
+    virtual void MutateLoadFlags(int child_id, int route_id,
+                                 int* load_flags) = 0;
+   protected:
+    Observer() {}
+    virtual ~Observer() {}
+  };
+
   explicit ResourceDispatcherHost(
       const ResourceQueue::DelegateSet& resource_queue_delegates);
   ~ResourceDispatcherHost();
@@ -244,6 +258,8 @@ class ResourceDispatcherHost : public net::URLRequest::Delegate {
   static bool is_prefetch_enabled();
   static void set_is_prefetch_enabled(bool value);
 
+  void set_observer(Observer* observer) { observer_ = observer; }

[cbentzel, 2011/05/24 17:13:54]

Please document lifetime expectations.

Also, would it make sense to pass into the constructor and always require it to
be non-NULL? 

[dominich, 2011/05/24 18:01:47]

Done.
That would reduce some of the checks in the implementation, but this is how
other observers have been set up already and I'd rather be consistent.

+
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            TestBlockedRequestsProcessDies);
@@ -476,8 +492,9 @@ class ResourceDispatcherHost : public net::URLRequest::Delegate {
   // to the source of the message.
   ResourceMessageFilter* filter_;
 
-  static bool is_prefetch_enabled_;
+  Observer* observer_;
 
+  static bool is_prefetch_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ResourceDispatcherHost);
 };