Revert of Name V8 snapshot according to target architecture (32/64 bit).

Revert of Name V8 snapshot according to target architecture (32/64 bit). (patchset #5 id:80001 of https://codereview.chromium.org/903793002/)

Reason for revert:
Some target_arch constants are wrong/missing, causing build breaks on those architectures.

Original issue's description:
> Name V8 snapshot according to target architecture (32/64 bit).
>
> Renaming webview copy of V8 snapshot to be able to differentiate
> between snapshots for 32- and 64 bit architectures.
> This is done so that snapshots for different architectures can be
> repacked into the same APK.
>
> BUG=455699
>
> Committed: https://crrev.com/0ae506b5a6eae5cf0e440752a4fb99b35e2b0f05
> Cr-Commit-Position: refs/heads/master@{#315314}

TBR=torne@chromium.org,rmcilroy@chromium.org,mef@chromium.org,kkimlabs@chromium.org,gsennton@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=455699
Committed: https://crrev.com/9963720b9c6c2e79dbff97d4c16f6b4bac4ab543
Cr-Commit-Position: refs/heads/master@{#315475}

[boliu, 2015-02-10 02:17:45]

Created Revert of Name V8 snapshot according to target architecture (32/64 bit).

[commit-bot: I haz the power, 2015-02-10 02:19:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/868363003/1

[commit-bot: I haz the power, 2015-02-10 02:19:52]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-10 02:21:13]

Patchset 1 (id:??) landed as
https://crrev.com/9963720b9c6c2e79dbff97d4c16f6b4bac4ab543
Cr-Commit-Position: refs/heads/master@{#315475}