IndexedDB: Zero no longer a valid value for maxCount in getAll().

IndexedDB: Zero no longer a valid value for maxCount in getAll().

Prior IDBObjectStore.getAll implementation used zero as the sentinel value
for maxCount to mean unlimited. This change eliminates that check on the
Chrome side. It is now the callers (Blink's) responsibility to pass in a very
large number (MAXUINT) if the intent is to have the response be unbounded.

BUG=457450
Committed: https://crrev.com/ca3da5230ce8725714fbeae15a9afbcb178f3ca3
Cr-Commit-Position: refs/heads/master@{#330225}

[cmumford, 2015-05-15 18:33:26]

cmumford@chromium.org changed reviewers:
+ jsbell@chromium.org

[jsbell, 2015-05-15 21:15:17]

lgtm

[cmumford, 2015-05-15 21:26:25]

The CQ bit was checked by cmumford@chromium.org

[commit-bot: I haz the power, 2015-05-15 21:27:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1138643007/1

[commit-bot: I haz the power, 2015-05-15 23:09:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-18 11:28:49]

Patchset 1 (id:??) landed as
https://crrev.com/ca3da5230ce8725714fbeae15a9afbcb178f3ca3
Cr-Commit-Position: refs/heads/master@{#330225}