Revert of Routes close requests from WM to client (patchset #4 id:50001 of https://codereview.chromium.org/1518593003/ )

Reason for revert:
This seems to break windows build for a link error, that is probably a visibility issue.

The error log is:
http://build.chromium.org/p/chromium.win/builders/Win%20x64%20GN%20%28dbg%29/builds/14955

browser_window.obj :error LNK2001: unresolved external symbol "public: virtual void __cdecl aura::WindowTreeHostObserver::OnHostMoved(class aura::WindowTreeHost const *,class gfx::Point const &)" (?OnHostMoved@WindowTreeHostObserver@aura@@UEAAXPEBVWindowTreeHost@2@AEBVPoint@gfx@@@Z)

browser_window.obj :error LNK2001: unresolved external symbol "public: virtual void __cdecl aura::WindowTreeHostObserver::OnHostResized(class aura::WindowTreeHost const *)" (?OnHostResized@WindowTreeHostObserver@aura@@UEAAXPEBVWindowTreeHost@2@@Z)

./desktop_ui_library.dll : fatalerror LNK1120: 2 unresolved externals

Original issue's description:
> Routes close requests from WM to client
>
> Adds WindowTree::WmRequestClose(). The WM invokes this when the user
> clicks the close button. This calls to
> WindowTreeClient::RequestClose() so that the client can close the
> window (if it wants to).
>
> In getting this to work I had to straighten out shutdown of
> NativeWidgetMus. Previously we keyed off the aura::Window going
> away and tried to do somethings if the mus::Window went away. I've
> centralized it so we cleanup when the mus::Window goes away.
>
> BUG=none
> TEST=none
> R=ben@chromium.org
>
> Committed: https://crrev.com/359ce52f32bf5d8ecbe7b719af983aa878f0e0de
> Cr-Commit-Position: refs/heads/master@{#364606}

TBR=ben@chromium.org,sky@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=none

Review URL: https://codereview.chromium.org/1509733009

Cr-Commit-Position: refs/heads/master@{#364612}

1 files changed, 1 insertions, 2 deletions

diff --git a/components/mus/ws/window_tree_unittest.cc b/components/mus/ws/window_tree_unittest.cc
index 5096093..71fd138 100644
--- a/components/mus/ws/window_tree_unittest.cc
+++ b/components/mus/ws/window_tree_unittest.cc
@@ -127,12 +127,11 @@ class TestWindowTreeClient : public mus::mojom::WindowTreeClient {
   void OnWindowFocused(uint32_t focused_window_id) override {
     tracker_.OnWindowFocused(focused_window_id);
   }
-  void OnWindowPredefinedCursorChanged(uint32_t window_id,
+  void OnWindowPredefinedCursorChanged(uint32 window_id,
                                        mojom::Cursor cursor_id) override {
     tracker_.OnWindowPredefinedCursorChanged(window_id, cursor_id);
   }
   void OnChangeCompleted(uint32_t change_id, bool success) override {}
-  void RequestClose(uint32_t window_id) override {}
   void WmSetBounds(uint32_t change_id,
                    Id window_id,
                    mojo::RectPtr bounds) override {}