Fix some uses of global variables in transient pages.

chrome/renderer/extensions/context_menus_custom_bindings.cc

Index: chrome/renderer/extensions/context_menus_custom_bindings.cc
diff --git a/chrome/renderer/extensions/context_menus_custom_bindings.cc b/chrome/renderer/extensions/context_menus_custom_bindings.cc
index db3b3d9b4e438f3fb105538929733e65306f3e05..7181a5d6fe507419214e356dd80bf7b6518da7e2 100644
--- a/chrome/renderer/extensions/context_menus_custom_bindings.cc
+++ b/chrome/renderer/extensions/context_menus_custom_bindings.cc
@@ -4,17 +4,18 @@
 
 #include "chrome/renderer/extensions/context_menus_custom_bindings.h"
 
+#include "chrome/common/extensions/extension_messages.h"
+#include "content/public/renderer/render_thread.h"
 #include "grit/renderer_resources.h"
 #include "v8/include/v8.h"
 
 namespace {
 
 v8::Handle<v8::Value> GetNextContextMenuId(const v8::Arguments& args) {
-  // Note: this works because contextMenus.create() only works in the
-  // extension process.  If that API is opened up to content scripts, this
-  // will need to change.  See crbug.com/77023
-  static int next_context_menu_id = 1;
-  return v8::Integer::New(next_context_menu_id++);
+  int context_menu_id = -1;
+  content::RenderThread::Get()->Send(
+      new ExtensionHostMsg_GenerateUniqueID(&context_menu_id));
+  return v8::Integer::New(context_menu_id);
 }
 
 }  // namespace