[Locked Fullscreen] Properly set window bounds for pinned windows

There was a bug in locked fullscreen where docked magnifier mode wasn't properly
cleaning up after being closed - the pinned (fullscreen) window wasn't being
restored to it's full height (it kept the smaller height into which the docked
magnifier pushed it).

Bug: 901485
Change-Id: I4121444506a0da349f8a1ea300c225a7c32b434d
Reviewed-on: https://chromium-review.googlesource.com/c/1454629
Auto-Submit: Ivan Šandrk <isandrk@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Ivan Šandrk <isandrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629581}

ash/wm/default_state.cc

@@ -378,7 +378,7 @@ bool DefaultState::SetMaximizedOrFullscreenBounds(WindowState* window_state) {
         screen_util::GetMaximizedWindowBoundsInParent(window_state->window()));
     return true;
   }
-  if (window_state->IsFullscreen()) {
+  if (window_state->IsFullscreen() || window_state->IsPinned()) {
     window_state->SetBoundsDirect(
         screen_util::GetDisplayBoundsInParent(window_state->window()));
     return true;