Revert of Prefer using ContextClient over ContextLifecycleObserver

Revert of Prefer using ContextClient over ContextLifecycleObserver (patchset #1 id:1 of https://codereview.chromium.org/2607533002/ )

Reason for revert:
This CL caused a flaky failure:

https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_11__dbg_/6744/layout-test-results/storage/indexeddb/observer-workers-crash-log.txt


Original issue's description:
> Prefer using ContextClient over ContextLifecycleObserver
> 
> ContextClient is more lightweight than ContextLifecycleObserver.
> Classes that don't override contextDestroyed should use ContextClient.
> 
> BUG=610176
> 
> Committed: https://crrev.com/46dcc19eebc7a63cee5b9aeb4e1284fd5f9adf6d
> Cr-Commit-Position: refs/heads/master@{#440822}

TBR=dcheng@chromium.org,sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=610176
Review-Url: https://codereview.chromium.org/2618753002
Cr-Commit-Position: refs/heads/master@{#441696}
Committed: https://chromium.googlesource.com/chromium/src/+/9d5d32b6a54f1f483fb0342a4be35ab974684d63

[haraken, 2017-01-05 15:52:44]

The CQ bit was checked by haraken@chromium.org

[haraken, 2017-01-05 15:52:44]

Created Revert of Prefer using ContextClient over ContextLifecycleObserver

[commit-bot: I haz the power, 2017-01-05 15:53:03]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[sof, 2017-01-05 16:37:03]

lgtm, thanks - only IDBTransaction would be running into this worker issue, i
think.

[jsbell, 2017-01-05 17:38:18]

On 2017/01/05 16:37:03, sof wrote:
> lgtm, thanks - only IDBTransaction would be running into this worker issue, i
> think.

Thanks as well - I was seeing this locally but had not yet tracked it down.

[commit-bot: I haz the power, 2017-01-05 17:49:43]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1483631564418760, "parent_rev":
"4d44e971a41797ff8bf686d92d0e58480be5c6b3", "commit_rev":
"9d5d32b6a54f1f483fb0342a4be35ab974684d63"}

[commit-bot: I haz the power, 2017-01-05 17:50:12]

Description was changed from

==========
Revert of Prefer using ContextClient over ContextLifecycleObserver (patchset #1
id:1 of https://codereview.chromium.org/2607533002/ )

Reason for revert:
This CL caused a flaky failure:

https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_11_...


Original issue's description:
> Prefer using ContextClient over ContextLifecycleObserver
> 
> ContextClient is more lightweight than ContextLifecycleObserver.
> Classes that don't override contextDestroyed should use ContextClient.
> 
> BUG=610176
> 
> Committed: https://crrev.com/46dcc19eebc7a63cee5b9aeb4e1284fd5f9adf6d
> Cr-Commit-Position: refs/heads/master@{#440822}

TBR=dcheng@chromium.org,sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=610176
==========

to

==========
Revert of Prefer using ContextClient over ContextLifecycleObserver (patchset #1
id:1 of https://codereview.chromium.org/2607533002/ )

Reason for revert:
This CL caused a flaky failure:

https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Mac10_11_...


Original issue's description:
> Prefer using ContextClient over ContextLifecycleObserver
> 
> ContextClient is more lightweight than ContextLifecycleObserver.
> Classes that don't override contextDestroyed should use ContextClient.
> 
> BUG=610176
> 
> Committed: https://crrev.com/46dcc19eebc7a63cee5b9aeb4e1284fd5f9adf6d
> Cr-Commit-Position: refs/heads/master@{#440822}

TBR=dcheng@chromium.org,sigbjornf@opera.com
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=610176

Review-Url: https://codereview.chromium.org/2618753002
Cr-Commit-Position: refs/heads/master@{#441696}
Committed:
https://chromium.googlesource.com/chromium/src/+/9d5d32b6a54f1f483fb0342a4be3...
==========

[commit-bot: I haz the power, 2017-01-05 17:50:12]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/9d5d32b6a54f1f483fb0342a4be3...