Remove indirection of cpufeatures.gypi.

Remove indirection of cpufeatures.gypi.

Now that android_webview_build is no longer supported, the extra level
of indirection of including cpufeatures.gypi instead of directly
depending on the cpufeatures target is not necessary. Remove the cases
in the Chromium tree. Other references appear in projects pulled in via
DEPS that will have to be fixed separately before cpufeatures.gypi can
be entirely deleted.

BUG=440793
Committed: https://crrev.com/9845b890dd38f0b88b0304f3bd6c437a7c6f8f8d
Cr-Commit-Position: refs/heads/master@{#324117}

[Torne, 2015-03-31 13:56:07]

torne@chromium.org changed reviewers:
+ agl@chromium.org, fbarchard@chromium.org, thakis@chromium.org

[Torne, 2015-03-31 13:56:07]

thakis: base/, build/, skia/
agl: crypto/
fbarchard: third_party/libwebp/

[Nico, 2015-03-31 15:24:00]

lgtm

[agl, 2015-03-31 17:45:37]

lgtm

[Torne, 2015-04-07 15:05:43]

torne@chromium.org changed reviewers:
+ urvang@chromium.org

[Torne, 2015-04-07 15:05:44]

+urvang for third_party/libwebp

[urvang, 2015-04-07 18:22:07]

lgtm

Rubberstamp LGTM for libwebp

[Torne, 2015-04-07 20:10:40]

The CQ bit was checked by torne@chromium.org

[commit-bot: I haz the power, 2015-04-07 20:11:23]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1045123005/1

[commit-bot: I haz the power, 2015-04-07 21:03:10]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-07 21:05:11]

Patchset 1 (id:??) landed as
https://crrev.com/9845b890dd38f0b88b0304f3bd6c437a7c6f8f8d
Cr-Commit-Position: refs/heads/master@{#324117}