Remove use of deprecated MessageLoop methods in android_webview.

Remove use of deprecated MessageLoop methods in android_webview.

MessageLoop::PostTask/PostDelayedTask/DeleteSoon/ReleaseSoon
are deprecated. This CL makes the following replacements to
remove some uses of these methods:

"MessageLoop(ForUI|ForIO)::current()->PostTask" ->
  "ThreadTaskRunnerHandle::Get()->PostTask"
"MessageLoop(ForUI|ForIO)::current()->PostDelayedTask" ->
  "ThreadTaskRunnerHandle::Get()->PostDelayedTask"
"MessageLoop(ForUI|ForIO)::current()->DeleteSoon" ->
  "ThreadTaskRunnerHandle::Get()->DeleteSoon"
"MessageLoop(ForUI|ForIO)::current()->ReleaseSoon" ->
  "ThreadTaskRunnerHandle::Get()->ReleaseSoon"

In files where these replacements are made, it adds these includes:
  #include "base/location.h"
  #include "base/single_thread_task_runner.h"
  #include "base/threading/thread_task_runner_handle.h"

And removes this include if it is no longer required:
  #include "base/message_loop/message_loop.h"

Why ThreadTaskRunnerHandle::Get() instead of
MessageLoop::current()->task_runner()?
 - The two are equivalent on threads that run a MessageLoop.
 - MessageLoop::current() doesn't work in base/task_scheduler
   because the scheduler's thread don't run MessageLoops.
   This CL will therefore facilitate the migration of browser
   threads to base/task_scheduler.

Steps to generate this patch:
1. Run message_loop_cleanup.py (see this CL's comments).
2. Run tools/sort-headers.py on modified files.
3. Run git cl format.

BUG=616447
R=boliu@chromium.org

Committed: https://crrev.com/1c293796bbc3c76d326f16176770040d466bf4dd
Cr-Commit-Position: refs/heads/master@{#398055}

[fdoray, 2016-06-06 16:40:50]

Can you review this CL? Thanks.

[boliu, 2016-06-06 16:44:49]

lgtm

[fdoray, 2016-06-06 17:01:16]

The CQ bit was checked by fdoray@chromium.org

[commit-bot: I haz the power, 2016-06-06 17:01:55]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2030193003/1

[commit-bot: I haz the power, 2016-06-06 17:41:43]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-06-06 17:43:05]

Description was changed from

==========
Remove use of deprecated MessageLoop methods in android_webview.

MessageLoop::PostTask/PostDelayedTask/DeleteSoon/ReleaseSoon
are deprecated. This CL makes the following replacements to
remove some uses of these methods:

"MessageLoop(ForUI|ForIO)::current()->PostTask" ->
  "ThreadTaskRunnerHandle::Get()->PostTask"
"MessageLoop(ForUI|ForIO)::current()->PostDelayedTask" ->
  "ThreadTaskRunnerHandle::Get()->PostDelayedTask"
"MessageLoop(ForUI|ForIO)::current()->DeleteSoon" ->
  "ThreadTaskRunnerHandle::Get()->DeleteSoon"
"MessageLoop(ForUI|ForIO)::current()->ReleaseSoon" ->
  "ThreadTaskRunnerHandle::Get()->ReleaseSoon"

In files where these replacements are made, it adds these includes:
  #include "base/location.h"
  #include "base/single_thread_task_runner.h"
  #include "base/threading/thread_task_runner_handle.h"

And removes this include if it is no longer required:
  #include "base/message_loop/message_loop.h"

Why ThreadTaskRunnerHandle::Get() instead of
MessageLoop::current()->task_runner()?
 - The two are equivalent on threads that run a MessageLoop.
 - MessageLoop::current() doesn't work in base/task_scheduler
   because the scheduler's thread don't run MessageLoops.
   This CL will therefore facilitate the migration of browser
   threads to base/task_scheduler.

Steps to generate this patch:
1. Run message_loop_cleanup.py (see this CL's comments).
2. Run tools/sort-headers.py on modified files.
3. Run git cl format.

BUG=616447
R=boliu@chromium.org
==========

to

==========
Remove use of deprecated MessageLoop methods in android_webview.

MessageLoop::PostTask/PostDelayedTask/DeleteSoon/ReleaseSoon
are deprecated. This CL makes the following replacements to
remove some uses of these methods:

"MessageLoop(ForUI|ForIO)::current()->PostTask" ->
  "ThreadTaskRunnerHandle::Get()->PostTask"
"MessageLoop(ForUI|ForIO)::current()->PostDelayedTask" ->
  "ThreadTaskRunnerHandle::Get()->PostDelayedTask"
"MessageLoop(ForUI|ForIO)::current()->DeleteSoon" ->
  "ThreadTaskRunnerHandle::Get()->DeleteSoon"
"MessageLoop(ForUI|ForIO)::current()->ReleaseSoon" ->
  "ThreadTaskRunnerHandle::Get()->ReleaseSoon"

In files where these replacements are made, it adds these includes:
  #include "base/location.h"
  #include "base/single_thread_task_runner.h"
  #include "base/threading/thread_task_runner_handle.h"

And removes this include if it is no longer required:
  #include "base/message_loop/message_loop.h"

Why ThreadTaskRunnerHandle::Get() instead of
MessageLoop::current()->task_runner()?
 - The two are equivalent on threads that run a MessageLoop.
 - MessageLoop::current() doesn't work in base/task_scheduler
   because the scheduler's thread don't run MessageLoops.
   This CL will therefore facilitate the migration of browser
   threads to base/task_scheduler.

Steps to generate this patch:
1. Run message_loop_cleanup.py (see this CL's comments).
2. Run tools/sort-headers.py on modified files.
3. Run git cl format.

BUG=616447
R=boliu@chromium.org

Committed: https://crrev.com/1c293796bbc3c76d326f16176770040d466bf4dd
Cr-Commit-Position: refs/heads/master@{#398055}
==========

[commit-bot: I haz the power, 2016-06-06 17:43:06]

Patchset 1 (id:??) landed as
https://crrev.com/1c293796bbc3c76d326f16176770040d466bf4dd
Cr-Commit-Position: refs/heads/master@{#398055}