[Refactor] Kill some dead code because it is no longer possible to drag maximized windows

ash/wm/window_state.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/wm/window_state.h"
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
 #include "ash/shell_window_ids.h"
@@ skipping 232 matching lines @@
 }
 
 void WindowState::AddObserver(WindowStateObserver* observer) {
   observer_list_.AddObserver(observer);
 }
 
 void WindowState::RemoveObserver(WindowStateObserver* observer) {
   observer_list_.RemoveObserver(observer);
 }
 
-bool WindowState::CreateDragDetails(aura::Window* window,
+void WindowState::CreateDragDetails(aura::Window* window,
                                     const gfx::Point& point_in_parent,
                                     int window_component,
                                     aura::client::WindowMoveSource source) {
-  scoped_ptr<DragDetails> details(new DragDetails(
-        window, point_in_parent, window_component, source));
-  if (!details->is_resizable)
-    return false;
-  drag_details_ = details.Pass();
-  return true;
+  drag_details_.reset(
+      new DragDetails(window, point_in_parent, window_component, source));
 }
 
 void WindowState::DeleteDragDetails() {
   drag_details_.reset();
 }
 
 void WindowState::OnWindowPropertyChanged(aura::Window* window,
                                           const void* key,
                                           intptr_t old) {
   DCHECK_EQ(window, window_);
@@ skipping 64 matching lines @@
   }
   return settings;
 }
 
 const WindowState* GetWindowState(const aura::Window* window) {
   return GetWindowState(const_cast<aura::Window*>(window));
 }
 
 }  // namespace wm
 }  // namespace ash