[Pepper] Wire up append mode writing support of FileIO

content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc

Index: content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
diff --git a/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc b/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
index 89d7d6800a9a5d8b838b606b2e8d7f2bfc4d975a..b6e40f01dfe5bca2b1b5e131bf202d9e7b2dc70f 100644
--- a/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
+++ b/content/browser/renderer_host/pepper/pepper_file_system_browser_host.cc
@@ -365,7 +365,7 @@ int32_t PepperFileSystemBrowserHost::OnHostMsgInitIsolatedFileSystem(
 int32_t PepperFileSystemBrowserHost::OnHostMsgReserveQuota(
     ppapi::host::HostMessageContext* context,
     int64_t amount,
-    const ppapi::FileSizeMap& file_sizes) {
+    const ppapi::FileGrowthMap& file_growths) {
   DCHECK(ChecksQuota());
   DCHECK(amount > 0);
 
@@ -373,11 +373,6 @@ int32_t PepperFileSystemBrowserHost::OnHostMsgReserveQuota(
     return PP_ERROR_INPROGRESS;
   reserving_quota_ = true;
 
-  ppapi::FileGrowthMap file_growths;
-  for (ppapi::FileSizeMap::const_iterator it = file_sizes.begin();
-       it != file_sizes.end(); ++it)
-    file_growths[it->first] = ppapi::FileGrowth(it->second, 0);
-
   int64_t reservation_amount = std::max<int64_t>(kMinimumQuotaReservationSize,
                                                  amount);
   file_system_context_->default_file_task_runner()->PostTask(