Moved the following IPC messages used by the chrome NPAPI plugin installer out of content

chrome/default_plugin/plugin_impl_gtk.cc

Index: chrome/default_plugin/plugin_impl_gtk.cc
===================================================================
--- chrome/default_plugin/plugin_impl_gtk.cc	(revision 98657)
+++ chrome/default_plugin/plugin_impl_gtk.cc	(working copy)
@@ -4,12 +4,16 @@
 
 #include "chrome/default_plugin/plugin_impl_gtk.h"
 
-#include <gdk/gdkx.h>
+#include <X11/Xdefs.h>
+#include <gtk/gtk.h>
 
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/string_util.h"
+#include "chrome/common/chrome_plugin_messages.h"
 #include "chrome/default_plugin/plugin_main.h"
+#include "content/common/child_thread.h"
+#include "content/common/content_constants.h"
 #include "googleurl/src/gurl.h"
 #include "grit/webkit_strings.h"
 #include "unicode/locid.h"
@@ -45,7 +49,8 @@
   instance_ = instance;
   mime_type_ = mime_type;
 
-  return true;
+  return PluginInstallerBase::Initialize(module_handle, instance, mime_type,
+                                         argc, argn, argv);
 }
 
 bool PluginInstallerImpl::NPP_SetWindow(NPWindow* window_info) {
@@ -133,9 +138,10 @@
 }
 
 void PluginInstallerImpl::NotifyPluginStatus(int status) {
-  default_plugin::g_browser->getvalue(
-      instance_,
-      static_cast<NPNVariable>(
-          webkit::npapi::default_plugin::kMissingPluginStatusStart + status),
-      NULL);
+  ChildThread::current()->Send(
+      new ChromePluginProcessHostMsg_MissingPluginStatus(
+          status,
+          renderer_process_id(),
+          render_view_id(),
+          0));
 }