Removes ShellPort::IsRunningInMash()

ash/mus/bridge/shell_port_mash.h

 // 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.
 
 #ifndef ASH_MUS_BRIDGE_SHELL_PORT_MASH_H_
 #define ASH_MUS_BRIDGE_SHELL_PORT_MASH_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 42 matching lines @@
   AcceleratorControllerDelegateAura* accelerator_controller_delegate_mus() {
     return mus_state_->accelerator_controller_delegate.get();
   }
 
   aura::WindowTreeClient* window_tree_client();
 
   WindowManager* window_manager() { return window_manager_; }
 
   // ShellPort:
   void Shutdown() override;
-  bool IsRunningInMash() const override;
   Config GetAshConfig() const override;
   WmWindow* GetPrimaryRootWindow() override;
   WmWindow* GetRootWindowForDisplayId(int64_t display_id) override;
   const display::ManagedDisplayInfo& GetDisplayInfo(
       int64_t display_id) const override;
   bool IsActiveDisplayId(int64_t display_id) const override;
   display::Display GetFirstDisplay() const override;
   bool IsInUnifiedMode() const override;
   bool IsInUnifiedModeIgnoreMirroring() const override;
   void SetDisplayWorkAreaInsets(WmWindow* window,
@@ skipping 70 matching lines @@
 
   std::unique_ptr<SessionStateDelegate> session_state_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellPortMash);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_BRIDGE_SHELL_PORT_MASH_H_