Rename WindowTreeHostPlatform::window_ to ::platform_window_

ui/aura/window_tree_host_platform.h

Index: ui/aura/window_tree_host_platform.h
diff --git a/ui/aura/window_tree_host_platform.h b/ui/aura/window_tree_host_platform.h
index 7cc90a524fe6b0748f23515a32a066ce0727bd60..0734078757985e380358ad9cb6fc535b16bb95a1 100644
--- a/ui/aura/window_tree_host_platform.h
+++ b/ui/aura/window_tree_host_platform.h
@@ -50,7 +50,7 @@ class AURA_EXPORT WindowTreeHostPlatform
   explicit WindowTreeHostPlatform(std::unique_ptr<WindowPort> window_port);
 
   void SetPlatformWindow(std::unique_ptr<ui::PlatformWindow> window);
-  ui::PlatformWindow* platform_window() { return window_.get(); }
+  ui::PlatformWindow* platform_window() { return platform_window_.get(); }
 
   // ui::PlatformWindowDelegate:
   void OnBoundsChanged(const gfx::Rect& new_bounds) override;
@@ -67,7 +67,7 @@ class AURA_EXPORT WindowTreeHostPlatform
 
  private:
   gfx::AcceleratedWidget widget_;
-  std::unique_ptr<ui::PlatformWindow> window_;
+  std::unique_ptr<ui::PlatformWindow> platform_window_;
   gfx::NativeCursor current_cursor_;
   gfx::Rect bounds_;