Adding ThreadChecker validation to d'tors for host classes

remoting/host/mouse_shape_pump.cc

 // Copyright 2015 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.
 
 #include "remoting/host/mouse_shape_pump.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 14 matching lines @@
     protocol::CursorShapeStub* cursor_shape_stub)
     : mouse_cursor_monitor_(std::move(mouse_cursor_monitor)),
       cursor_shape_stub_(cursor_shape_stub),
       capture_timer_(true, true) {
   mouse_cursor_monitor_->Init(this, webrtc::MouseCursorMonitor::SHAPE_ONLY);
   capture_timer_.Start(
       FROM_HERE, base::TimeDelta::FromMilliseconds(kCursorCaptureIntervalMs),
       base::Bind(&MouseShapePump::Capture, base::Unretained(this)));
 }
 
-MouseShapePump::~MouseShapePump() {}
+MouseShapePump::~MouseShapePump() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+}
 
 void MouseShapePump::Capture() {
   DCHECK(thread_checker_.CalledOnValidThread());
 
   mouse_cursor_monitor_->Capture();
 }
 
 void MouseShapePump::OnMouseCursor(webrtc::MouseCursor* cursor) {
   DCHECK(thread_checker_.CalledOnValidThread());
 
@@ skipping 20 matching lines @@
 }
 
 void MouseShapePump::OnMouseCursorPosition(
     webrtc::MouseCursorMonitor::CursorState state,
     const webrtc::DesktopVector& position) {
   // We're not subscribing to mouse position changes.
   NOTREACHED();
 }
 
 }  // namespace remoting