ServiceWorker: Remove unnecessary accessors for uncommitted/purgeable resources

ServiceWorker: Remove unnecessary accessors for uncommitted/purgeable resources

This is a refactoring CL.

Resources managed by service worker should belong to one of following lists for
their whole lifetime: uncommitted, committed and purgeable. They are allowed to
move among the lists as following rules:

  1. <new> -> uncommitted -> committed -> purgeable -> <doomed>
  2. <new> -> uncommitted -> purgeable -> <doomed>

To strictly obey the rules, this CL...

  - removes ClearUncommittedResourceIds(). Uncommitted resources to be doomed
    should be moved into the purgeable list rather than directly removed from
    the uncommitted list.
  - removes WritePurgeableResourceIds(). Resources to be doomed should not be
    directly written in the purgeable list. They should be moved from the
    uncommitted or committed list.

BUG=485900
Committed: https://crrev.com/fb707420e296d3d594aef9ecb5d787b995ee5e55
Cr-Commit-Position: refs/heads/master@{#354237}

[nhiroki, 2015-10-15 05:05:58]

nhiroki@chromium.org changed reviewers:
+ falken@chromium.org, horo@chromium.org

[nhiroki, 2015-10-15 05:05:59]

PTAL, thanks!

[falken, 2015-10-15 05:27:57]

lgtm

[nhiroki, 2015-10-15 05:31:09]

The CQ bit was checked by nhiroki@chromium.org

[commit-bot: I haz the power, 2015-10-15 05:31:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1404163003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1404163003/1

[commit-bot: I haz the power, 2015-10-15 06:54:58]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-10-15 06:54:59]

Try jobs failed on following builders:
  win_chromium_x64_rel_ng on tryserver.chromium.win (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[nhiroki, 2015-10-15 07:02:36]

The CQ bit was checked by nhiroki@chromium.org

[commit-bot: I haz the power, 2015-10-15 07:02:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1404163003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1404163003/1

[commit-bot: I haz the power, 2015-10-15 08:01:09]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-15 08:01:54]

Patchset 1 (id:??) landed as
https://crrev.com/fb707420e296d3d594aef9ecb5d787b995ee5e55
Cr-Commit-Position: refs/heads/master@{#354237}