Always activate MojoApplicationHost

Always activate MojoApplicationHost

Before this change, MojoApplicatioHost was activated only if some
browser-side modules requested it. There was no way for renderer
to activate it.

This CL let MojoApplicationHost always get activated. Now
renderer can request services it needs without its own activation flow.

R=darin@chromium.org,tsepez@chromium.org
TEST=none
BUG=none

Committed: https://crrev.com/bd0aa4dc467c10a4301e44084d8abbba92a35e56
Cr-Commit-Position: refs/heads/master@{#294969}

Committed: https://crrev.com/2c0a563d3019940343e804c7e975bef1bd0f5b54
Cr-Commit-Position: refs/heads/master@{#297551}

Committed: https://crrev.com/869f0b293620e33800662618bffcd738cdbdde38
Cr-Commit-Position: refs/heads/master@{#300021}

[darin (slow to review), 2014-09-15 04:49:32]

LGTM

https://codereview.chromium.org/563373002/diff/1/content/browser/renderer_hos...
File content/browser/renderer_host/render_process_host_impl.cc (left):

https://codereview.chromium.org/563373002/diff/1/content/browser/renderer_hos...
content/browser/renderer_host/render_process_host_impl.cc:651: if
(!mojo_application_host_->did_activate())
it turns out this was the only caller of did_activate().

[darin (slow to review), 2014-09-15 04:52:45]

The CQ bit was checked by darin@chromium.org

[darin (slow to review), 2014-09-15 04:52:49]

The CQ bit was unchecked by darin@chromium.org

[Hajime Morrita, 2014-09-15 17:36:05]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-09-15 18:02:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/563373002/20001

[commit-bot: I haz the power, 2014-09-16 01:54:40]

Committed patchset #2 (id:20001) as bb7ad959821ff7fb56724f484559966e0b66fbb2

[commit-bot: I haz the power, 2014-09-16 02:02:18]

Patchset 2 (id:??) landed as
https://crrev.com/bd0aa4dc467c10a4301e44084d8abbba92a35e56
Cr-Commit-Position: refs/heads/master@{#294969}

[Hajime Morrita, 2014-09-22 16:54:32]

The change was reverted https://codereview.chromium.org/584173002/
as it did crash.

[Hajime Morrita, 2014-09-30 23:40:51]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-09-30 23:42:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/563373002/40001

[commit-bot: I haz the power, 2014-09-30 23:59:13]

Committed patchset #3 (id:40001) as dd8f379e31c76ea58868b8d1b8c8374976f8a398

[commit-bot: I haz the power, 2014-09-30 23:59:48]

Patchset 3 (id:??) landed as
https://crrev.com/2c0a563d3019940343e804c7e975bef1bd0f5b54
Cr-Commit-Position: refs/heads/master@{#297551}

[Hajime Morrita, 2014-10-16 21:52:16]

The CQ bit was checked by morrita@chromium.org

[commit-bot: I haz the power, 2014-10-16 21:55:58]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/563373002/60001

[commit-bot: I haz the power, 2014-10-17 00:13:13]

Committed patchset #4 (id:60001)

[commit-bot: I haz the power, 2014-10-17 00:13:36]

Patchset 4 (id:??) landed as
https://crrev.com/869f0b293620e33800662618bffcd738cdbdde38
Cr-Commit-Position: refs/heads/master@{#300021}