Remove the seemlingly uncecessary AddPreTargetHandler

BUG=None
R=sadrul@chromium.org

Review URL: https://codereview.chromium.org/306063007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274355 0039d316-1c4b-4281-b951-d872f2087c98

ash/shell.cc

@@ -862,8 +862,6 @@ void Shell::Init(const ShellInitParams& init_params) {
   window_modality_controller_.reset(
       new ::wm::WindowModalityController(this));
 
-  AddPreTargetHandler(this);
-
   env_filter_.reset(new ::wm::CompoundEventFilter);
   AddPreTargetHandler(env_filter_.get());