Migrate HostZoomMap to live in StoragePartition.

content/browser/plugin_process_host.cc

Index: content/browser/plugin_process_host.cc
diff --git a/content/browser/plugin_process_host.cc b/content/browser/plugin_process_host.cc
index 040fafe88aaba3dae8edcb9145d9c03a0d1e8c9c..59e2193d640eb48c582d835036f24be747a749ea 100644
--- a/content/browser/plugin_process_host.cc
+++ b/content/browser/plugin_process_host.cc
@@ -241,8 +241,9 @@ bool PluginProcessHost::Init(const WebPluginInfo& info) {
 
   // TODO(jam): right now we're passing NULL for appcache, blob storage, and
   // file system. If NPAPI plugins actually use this, we'll have to plumb them.
+  // TODO(wjmaclean): we're also passing NULL for the host zoom level context.
   ResourceMessageFilter* resource_message_filter = new ResourceMessageFilter(
-      process_->GetData().id, PROCESS_TYPE_PLUGIN, NULL, NULL, NULL, NULL,
+      process_->GetData().id, PROCESS_TYPE_PLUGIN, NULL, NULL, NULL, NULL, NULL,
       get_contexts_callback);
   process_->AddFilter(resource_message_filter);
   return true;