Remove isSyncDatabase in WebDatabaseObserver [2/3]

Remove isSyncDatabase in WebDatabaseObserver [2/3]

Removed codes related to isSyncDatabase and switched to the new methods
that were introduced in the previous patch.

[1] https://codereview.chromium.org/660873004/
[2] THIS PATCH
[3] https://codereview.chromium.org/669063002/

BUG=428254
Committed: https://crrev.com/9ce67b848a520bf733599ed13549a08aac9daf2f
Cr-Commit-Position: refs/heads/master@{#302301}

[rtakacs, 2014-10-22 09:27:22]

rtakacs.u-szeged@partner.samsung.com changed reviewers:
+ jam@chromium.org, kinuko@google.com, michaeln@chromium.org

[jam, 2014-10-22 22:44:00]

lgtm

[rtakacs, 2014-10-30 19:42:42]

The CQ bit was checked by rtakacs.u-szeged@partner.samsung.com

[commit-bot: I haz the power, 2014-10-30 19:44:04]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/666333002/1

[commit-bot: I haz the power, 2014-10-30 19:53:08]

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

[commit-bot: I haz the power, 2014-10-30 19:53:09]

Try jobs failed on following builders:
  linux_chromium_gn_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)
  mac_chromium_compile_dbg on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/mac_chromium_comp...)

[rtakacs, 2014-10-31 16:23:21]

The CQ bit was checked by rtakacs.u-szeged@partner.samsung.com

[commit-bot: I haz the power, 2014-10-31 16:24:08]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/666333002/1

[commit-bot: I haz the power, 2014-10-31 19:01:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-31 19:02:21]

Patchset 1 (id:??) landed as
https://crrev.com/9ce67b848a520bf733599ed13549a08aac9daf2f
Cr-Commit-Position: refs/heads/master@{#302301}