Convert URLLoader to the new proxy design

content/public/renderer/renderer_ppapi_host.h

Index: content/public/renderer/renderer_ppapi_host.h
diff --git a/content/public/renderer/renderer_ppapi_host.h b/content/public/renderer/renderer_ppapi_host.h
index 3cd550c2a3747b0159da64cd72d3fc0b34cd9264..27c1f1fc7ca8c060da08b642eea979e9aa4e75ac 100644
--- a/content/public/renderer/renderer_ppapi_host.h
+++ b/content/public/renderer/renderer_ppapi_host.h
@@ -7,6 +7,7 @@
 
 #include "base/memory/ref_counted.h"
 #include "base/platform_file.h"
+#include "base/process.h"
 #include "content/common/content_export.h"
 #include "ipc/ipc_platform_file.h"
 #include "ppapi/c/pp_instance.h"
@@ -90,6 +91,10 @@ class RendererPpapiHost {
   virtual WebKit::WebPluginContainer* GetContainerForInstance(
       PP_Instance instance) const = 0;
 
+  // Returns the PID of the child process containing the plugin. If running
+  // in-process, this returns base::kNullProcessId.
+  virtual base::ProcessId GetPluginPID() const = 0;
+
   // Returns the PlatformGraphics2D for the given plugin resource, or NULL if
   // the resource is invalid.
   virtual webkit::ppapi::PluginDelegate::PlatformGraphics2D*