Revert "The expected key is a valid identifier, which is already free of \\, <0x20, "."

Revert "The expected key is a valid identifier, which is already free of \\, <0x20, "."
The optimization is invalid as indicated by the test.

BUG=
TBR=yangguo@chromium.org

Committed: https://crrev.com/460187b56390cd423f68558cafd9924e7b71d4fa
Cr-Commit-Position: refs/heads/master@{#26799}

[Toon Verwaest, 2015-02-23 17:16:21]

verwaest@chromium.org changed reviewers:
+ yangguo@chromium.org

[Toon Verwaest, 2015-02-23 17:16:32]

The CQ bit was checked by verwaest@chromium.org

[commit-bot: I haz the power, 2015-02-23 17:16:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/950873003/1

[commit-bot: I haz the power, 2015-02-23 17:57:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-23 17:57:29]

Patchset 1 (id:??) landed as
https://crrev.com/460187b56390cd423f68558cafd9924e7b71d4fa
Cr-Commit-Position: refs/heads/master@{#26799}

[Yang, 2015-02-24 07:29:18]

On 2015/02/23 17:57:29, I haz the power (commit-bot) wrote:
> Patchset 1 (id:??) landed as
> https://crrev.com/460187b56390cd423f68558cafd9924e7b71d4fa
> Cr-Commit-Position: refs/heads/master@{#26799}

lgtm.