Remove unused window_activity_tracker* files

These files are not mentioned in BUILD.gn files.
The cc and mm files also mention headers that do not exist.

Bug: None
Change-Id: Ifb459ff2e515efa857e1e48748b3cfab9a4151c6
Reviewed-on: https://chromium-review.googlesource.com/c/1287301
Commit-Queue: Yuri Wiitala <miu@chromium.org>
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600604}

content/browser/media/capture/window_activity_tracker.h

-// Copyright (c) 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.
-
-#ifndef CONTENT_BROWSER_MEDIA_CAPTURE_WINDOW_ACTIVITY_TRACKER_H_
-#define CONTENT_BROWSER_MEDIA_CAPTURE_WINDOW_ACTIVITY_TRACKER_H_
-
-#include <memory>
-
-#include "base/callback.h"
-#include "base/macros.h"
-#include "base/memory/weak_ptr.h"
-#include "content/common/content_export.h"
-#include "ui/gfx/native_widget_types.h"
-
-namespace content {
-
-// WindowActivityTracker is an interface that can be implememented to report
-// whether the user is actively interacting with UI.
-class CONTENT_EXPORT WindowActivityTracker {
- public:
-  static std::unique_ptr<WindowActivityTracker> Create(gfx::NativeView view);
-
-  WindowActivityTracker();
-  virtual ~WindowActivityTracker();
-
-  // Returns true if UI interaction is active.
-  bool IsUiInteractionActive() const;
-
-  // Reports on every mouse movement activity on the window.
-  void RegisterMouseInteractionObserver(const base::Closure& observer);
-
-  // Resets any previous UI activity tracked.
-  void Reset();
-
-  // Returns a weak pointer.
-  virtual base::WeakPtr<WindowActivityTracker> GetWeakPtr() = 0;
-
- protected:
-  void OnMouseActivity();
-
- private:
-  // The last time a UI event was detected.
-  base::TimeTicks last_time_ui_event_detected_;
-
-  // Runs on any mouse interaction from user.
-  base::Closure mouse_interaction_observer_;
-
-  // The number of UI events detected so far. In case of continuous events
-  // such as mouse movement, a single continuous movement is treated
-  // as one event.
-  int ui_events_count_;
-
-  DISALLOW_COPY_AND_ASSIGN(WindowActivityTracker);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_MEDIA_CAPTURE_WINDOW_ACTIVITY_TRACKER_H_

content/browser/media/capture/window_activity_tracker_aura.cc

-// Copyright (c) 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 "content/browser/media/capture/window_activity_tracker_aura.h"
-
-#include "base/logging.h"
-#include "ui/aura/window.h"
-#include "ui/aura/window_tree_host.h"
-#include "ui/events/event_utils.h"
-
-namespace content {
-
-// static
-std::unique_ptr<WindowActivityTracker> WindowActivityTracker::Create(
-    gfx::NativeView window) {
-  return std::unique_ptr<WindowActivityTracker>(
-      new WindowActivityTrackerAura(window));
-}
-
-WindowActivityTrackerAura::WindowActivityTrackerAura(aura::Window* window)
-    : window_(window),
-      weak_factory_(this) {
-  if (window_) {
-    window_->AddObserver(this);
-    window_->AddPreTargetHandler(this);
-  }
-}
-
-WindowActivityTrackerAura::~WindowActivityTrackerAura() {
-  if (window_) {
-    window_->RemoveObserver(this);
-    window_->RemovePreTargetHandler(this);
-  }
-}
-
-base::WeakPtr<WindowActivityTracker> WindowActivityTrackerAura::GetWeakPtr() {
-  return weak_factory_.GetWeakPtr();
-}
-
-void WindowActivityTrackerAura::OnEvent(ui::Event* event) {
-  switch (event->type()) {
-    case ui::ET_MOUSE_PRESSED:
-    case ui::ET_MOUSE_RELEASED:
-    case ui::ET_MOUSE_MOVED:
-      WindowActivityTracker::OnMouseActivity();
-      break;
-    default:
-      break;
-  }
-}
-
-void WindowActivityTrackerAura::OnWindowDestroying(aura::Window* window) {
-  DCHECK_EQ(window_, window);
-  window_->RemovePreTargetHandler(this);
-  window_->RemoveObserver(this);
-  window_ = nullptr;
-}
-
-}  // namespace content

content/browser/media/capture/window_activity_tracker_mac.mm

-// Copyright 2016 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 "content/browser/media/capture/window_activity_tracker_mac.h"
-
-#include <AppKit/AppKit.h>
-#include <CoreFoundation/CoreFoundation.h>
-
-#include "base/bind.h"
-#include "ui/base/cocoa/tracking_area.h"
-
-@implementation MouseTracker
-
-- (instancetype)initWithView:(NSView*)nsView {
-  self = [super init];
-  // TODO(isheriff): why are there no pressed/released events ?
-  NSTrackingAreaOptions trackingOptions =
-      NSTrackingMouseMoved | NSTrackingMouseEnteredAndExited |
-      NSTrackingActiveInKeyWindow | NSTrackingInVisibleRect;
-  trackingArea_.reset([[CrTrackingArea alloc] initWithRect:NSZeroRect
-                                                   options:trackingOptions
-                                                     owner:self
-                                                  userInfo:nil]);
-  [nsView addTrackingArea:trackingArea_.get()];
-  nsView_ = nsView;
-  return self;
-}
-
-- (void)stopTracking {
-  if (trackingArea_.get()) {
-    [nsView_ removeTrackingArea:trackingArea_.get()];
-    trackingArea_.reset();
-  }
-}
-
-- (void)registerMouseInteractionObserver:(const base::Closure&)observer {
-  mouseInteractionObserver_ = observer;
-}
-
-- (void)mouseMoved:(NSEvent*)theEvent {
-  mouseInteractionObserver_.Run();
-}
-
-- (void)mouseEntered:(NSEvent*)theEvent {
-}
-
-- (void)mouseExited:(NSEvent*)theEvent {
-}
-
-@end
-
-namespace content {
-
-// static
-std::unique_ptr<WindowActivityTracker> WindowActivityTracker::Create(
-    gfx::NativeView view) {
-  return std::unique_ptr<WindowActivityTracker>(
-      new WindowActivityTrackerMac(view));
-}
-
-WindowActivityTrackerMac::WindowActivityTrackerMac(NSView* view)
-    : weak_factory_(this) {
-  mouse_tracker_.reset([[MouseTracker alloc] initWithView:view]);
-  [mouse_tracker_ registerMouseInteractionObserver:
-                      base::Bind(&WindowActivityTrackerMac::OnMouseActivity,
-                                 base::Unretained(this))];
-}
-
-WindowActivityTrackerMac::~WindowActivityTrackerMac() {
-  [mouse_tracker_ stopTracking];
-}
-
-void WindowActivityTrackerMac::OnMouseActivity() {
-  WindowActivityTracker::OnMouseActivity();
-}
-
-base::WeakPtr<WindowActivityTracker> WindowActivityTrackerMac::GetWeakPtr() {
-  return weak_factory_.GetWeakPtr();
-}
-
-}  // namespace content