[mus+ash] Removes WmWindow from ash/wm/root_window_finder.h

ash/frame/caption_buttons/frame_size_button.cc

Index: ash/frame/caption_buttons/frame_size_button.cc
diff --git a/ash/frame/caption_buttons/frame_size_button.cc b/ash/frame/caption_buttons/frame_size_button.cc
index 59ce4291072b8224b20148fefa53f1002ec92401..a98ba8cba1204b353af8c9ab595509fd52fcee0c 100644
--- a/ash/frame/caption_buttons/frame_size_button.cc
+++ b/ash/frame/caption_buttons/frame_size_button.cc
@@ -9,7 +9,6 @@
 #include "ash/wm/window_state.h"
 #include "ash/wm/wm_event.h"
 #include "ash/wm/workspace/phantom_window_controller.h"
-#include "ash/wm_window.h"
 #include "base/i18n/rtl.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/geometry/vector2d.h"
@@ -214,8 +213,7 @@ void FrameSizeButton::UpdateSnapType(const ui::LocatedEvent& event) {
   if (snap_type_ == SNAP_LEFT || snap_type_ == SNAP_RIGHT) {
     aura::Window* window = frame_->GetNativeWindow();
     if (!phantom_window_controller_.get()) {
-      phantom_window_controller_.reset(
-          new PhantomWindowController(WmWindow::Get(window)));
+      phantom_window_controller_.reset(new PhantomWindowController(window));
     }
     gfx::Rect phantom_bounds_in_screen =
         (snap_type_ == SNAP_LEFT)
@@ -246,8 +244,8 @@ bool FrameSizeButton::CommitSnap(const ui::LocatedEvent& event) {
   UpdateSnapType(event);
 
   if (in_snap_mode_ && (snap_type_ == SNAP_LEFT || snap_type_ == SNAP_RIGHT)) {
-    WmWindow* window = WmWindow::Get(frame_->GetNativeWindow());
-    wm::WindowState* window_state = window->GetWindowState();
+    wm::WindowState* window_state =
+        wm::GetWindowState(frame_->GetNativeWindow());
     const wm::WMEvent snap_event(snap_type_ == SNAP_LEFT
                                      ? wm::WM_EVENT_SNAP_LEFT
                                      : wm::WM_EVENT_SNAP_RIGHT);