Rename PepperPluginDelegateImpl to PepperHelperImpl after getting rid of the PluginDelegate interfa…

content/renderer/pepper/pepper_file_io_host.cc

Index: content/renderer/pepper/pepper_file_io_host.cc
===================================================================
--- content/renderer/pepper/pepper_file_io_host.cc	(revision 214411)
+++ content/renderer/pepper/pepper_file_io_host.cc	(working copy)
@@ -16,7 +16,7 @@
 #include "content/public/common/content_client.h"
 #include "content/public/renderer/content_renderer_client.h"
 #include "content/renderer/pepper/host_globals.h"
-#include "content/renderer/pepper/pepper_plugin_delegate_impl.h"
+#include "content/renderer/pepper/pepper_helper_impl.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
 #include "content/renderer/pepper/ppb_file_ref_impl.h"
 #include "content/renderer/pepper/quota_file_io.h"
@@ -229,12 +229,11 @@
       base::Bind(&DidOpenFileSystemURL, callback),
       base::Bind(&DidFailOpenFileSystemURL, callback));
   } else {
-    PepperPluginDelegateImpl* plugin_delegate =
-        static_cast<PepperPluginInstanceImpl*>(
-            PepperPluginInstance::Get(pp_instance()))->delegate();
-    if (file_system_type_ != PP_FILESYSTEMTYPE_EXTERNAL || !plugin_delegate)
+    PepperHelperImpl* helper = static_cast<PepperPluginInstanceImpl*>(
+        PepperPluginInstance::Get(pp_instance()))->helper();
+    if (file_system_type_ != PP_FILESYSTEMTYPE_EXTERNAL || !helper)
       return PP_ERROR_FAILED;
-    if (!plugin_delegate->AsyncOpenFile(
+    if (!helper->AsyncOpenFile(
             file_ref->GetSystemPath(), flags,
             base::Bind(&PepperFileIOHost::ExecutePlatformOpenFileCallback,
                        weak_factory_.GetWeakPtr(),