[Pepper] Wire up append mode writing support of FileIO

content/browser/renderer_host/pepper/pepper_file_io_host.cc

Index: content/browser/renderer_host/pepper/pepper_file_io_host.cc
diff --git a/content/browser/renderer_host/pepper/pepper_file_io_host.cc b/content/browser/renderer_host/pepper/pepper_file_io_host.cc
index e66219bdf23b1ea968e6579f154337e848d9131d..da802e578abda98b58b382d67c836975810ead2c 100644
--- a/content/browser/renderer_host/pepper/pepper_file_io_host.cc
+++ b/content/browser/renderer_host/pepper/pepper_file_io_host.cc
@@ -334,11 +334,9 @@ int32_t PepperFileIOHost::OnHostMsgFlush(
 
 int32_t PepperFileIOHost::OnHostMsgClose(
     ppapi::host::HostMessageContext* context,
-    int64_t max_written_offset) {
+    const ppapi::FileGrowth& file_growth) {
   if (check_quota_) {
-    file_system_host_->CloseQuotaFile(
-        this,
-        ppapi::FileGrowth(max_written_offset, 0));
+    file_system_host_->CloseQuotaFile(this, file_growth);
     check_quota_ = false;
   }