Reland: Do not kill recently killed ARC processes again

Reland: Do not kill recently killed ARC processes again

ARC processes sometimes respawn right after being killed. In that case,
killing them every time is just a waste of resources.

BUG=706048
TEST=try
TEST=Follow crbug.com/706048#c76, confirm Chrome no longer kills the
 processes too often.
TEST=gn gen out/Debug --args='is_debug=true use_goma=true target_os="chromeos"
 is_component_build=true remove_webcore_debug_symbols=true' &&
 ninja -C out/Debug unit_tests

Review-Url: https://codereview.chromium.org/2861613002
Cr-Commit-Position: refs/heads/master@{#469092}
(cherry picked from commit eba2b9c32c0df7536d5884ab0d645b2701815206)

Review-Url: https://codereview.chromium.org/2877653003 .
Cr-Commit-Position: refs/branch-heads/3071@{#510}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/366a857bd21112ffbb191aa37932cfae74d24c10

[Yusuke Sato, 2017-05-11 04:24:09]

Description was changed from

==========
Reland: Do not kill recently killed ARC processes again

ARC processes sometimes respawn right after being killed. In that case,
killing them every time is just a waste of resources.

BUG=706048
TEST=try
TEST=Follow crbug.com/706048#c76, confirm Chrome no longer kills the
 processes too often.
TEST=gn gen out/Debug --args='is_debug=true use_goma=true target_os="chromeos"
 is_component_build=true remove_webcore_debug_symbols=true' &&
 ninja -C out/Debug unit_tests

Review-Url: https://codereview.chromium.org/2861613002
Cr-Commit-Position: refs/heads/master@{#469092}
(cherry picked from commit eba2b9c32c0df7536d5884ab0d645b2701815206)
==========

to

==========
Reland: Do not kill recently killed ARC processes again

ARC processes sometimes respawn right after being killed. In that case,
killing them every time is just a waste of resources.

BUG=706048
TEST=try
TEST=Follow crbug.com/706048#c76, confirm Chrome no longer kills the
 processes too often.
TEST=gn gen out/Debug --args='is_debug=true use_goma=true target_os="chromeos"
 is_component_build=true remove_webcore_debug_symbols=true' &&
 ninja -C out/Debug unit_tests

Review-Url: https://codereview.chromium.org/2861613002
Cr-Commit-Position: refs/heads/master@{#469092}
(cherry picked from commit eba2b9c32c0df7536d5884ab0d645b2701815206)

Review-Url: https://codereview.chromium.org/2877653003 .
Cr-Commit-Position: refs/branch-heads/3071@{#510}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/366a857bd21112ffbb191aa37932...
==========

[Yusuke Sato, 2017-05-11 04:24:11]

Committed patchset #1 (id:1) manually as
366a857bd21112ffbb191aa37932cfae74d24c10.