Remove unused |context| from GetDefaultParent().

ash/common/wm/container_finder.cc

 // Copyright 2016 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/common/wm/container_finder.h"
 
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm/always_on_top_controller.h"
 #include "ash/common/wm/root_window_finder.h"
 #include "ash/common/wm/window_state.h"
@@ skipping 52 matching lines @@
 }  // namespace
 
 WmWindow* GetContainerForWindow(WmWindow* window) {
   WmWindow* parent = window->GetParent();
   // The first parent with an explicit shell window ID is the container.
   while (parent && parent->GetShellWindowId() == kShellWindowId_Invalid)
     parent = parent->GetParent();
   return parent;
 }
 
-WmWindow* GetDefaultParent(WmWindow* context,
-                           WmWindow* window,
-                           const gfx::Rect& bounds) {
+WmWindow* GetDefaultParent(WmWindow* window, const gfx::Rect& bounds) {
   WmWindow* target_root = nullptr;
   WmWindow* transient_parent = window->GetTransientParent();
   if (transient_parent) {
     // Transient window should use the same root as its transient parent.
     target_root = transient_parent->GetRootWindow();
   } else {
     target_root = FindContainerRoot(bounds);
   }
 
   switch (window->GetType()) {
@@ skipping 37 matching lines @@
     if (priority_root && priority_root->Contains(container))
       containers.insert(containers.begin(), container);
     else
       containers.push_back(container);
   }
   return containers;
 }
 
 }  // namespace wm
 }  // namespace ash