mac: Remove workarounds for the MessagePump timer invalidation hack.

The CFRunLoopTimer invalidation hack has been removed from MessagePump,
so the workarounds for bugs caused by it can be removed.

Bug: 925998, 920795, 1031343
Change-Id: I0c560a5569d798b3b41f5c287b2dc36fd0fcb715
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2251746Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Robert Sesek <rsesek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#779929}

chrome/app_shim/chrome_main_app_mode_mac.mm

@@ -63,12 +63,6 @@ __attribute__((visibility("default"))) int APP_SHIM_ENTRY_POINT_NAME(
 
 }  // extern "C"
 
-void PostRepeatingDelayedTask() {
-  base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-      FROM_HERE, base::BindOnce(&PostRepeatingDelayedTask),
-      base::TimeDelta::FromDays(1));
-}
-
 int APP_SHIM_ENTRY_POINT_NAME(const app_mode::ChromeAppModeInfo* info) {
   base::CommandLine::Init(info->argc, info->argv);
 
@@ -142,14 +136,6 @@ int APP_SHIM_ENTRY_POINT_NAME(const app_mode::ChromeAppModeInfo* info) {
     ui::WindowResizeHelperMac::Get()->Init(main_task_executor.task_runner());
     base::PlatformThread::SetName("CrAppShimMain");
 
-    // TODO(https://crbug.com/925998): This workaround ensures that there is
-    // always delayed work enqueued. If there is ever not enqueued delayed work,
-    // then NSMenus and NSAlerts can start misbehaving (see
-    // https://crbug.com/920795 for examples). This workaround is not an
-    // appropriate solution to the problem, and should be replaced by a fix in
-    // the relevant message pump code.
-    PostRepeatingDelayedTask();
-
     AppShimController::Params controller_params;
     // Note that |info->user_data_dir| for shims contains the app data path,
     // <user_data_dir>/<profile_dir>/Web Applications/_crx_extensionid/.

remoting/host/mac/permission_wizard.mm

@@ -13,7 +13,6 @@
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/task/post_task.h"
-#include "base/threading/thread_task_runner_handle.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "remoting/base/string_resources.h"
@@ -514,16 +513,6 @@ void PermissionWizard::Impl::OnPermissionCheckResult(bool result) {
 
   _hasPermission = result;
 
-  // Ugly workaround for crbug.com/1031343:
-  // Polling stops when permission is granted. Posting a task to execute in the
-  // future seems to keep the system's UI message-pump active, in order to
-  // render the button outlines.
-  // TODO(lambroslambrou): Remove this hack and fix the underlying problem.
-  if (_hasPermission) {
-    base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
-        FROM_HERE, base::DoNothing(), base::TimeDelta::Max());
-  }
-
   if (_hasPermission && _autoAdvance) {
     // Skip showing the "Next" button, and immediately kick off a permission
     // check for the next page, if any.