Revert of Add AwAssets into android_webview/native/public

Revert of Add AwAssets into android_webview/native/public (patchset #4 id:70009 of https://codereview.chromium.org/937863003/)

Reason for revert:
Suspected to cause 'checkdeps' failures on Linux bot:
http://build.chromium.org/p/chromium.linux/builders/Linux%20Tests/builds/20990/steps/checkdeps/logs/stdio

ERROR in /mnt/data/b/build/slave/Linux_Tests/build/src/android_webview/browser/aw_dev_tools_manager_delegate.cc
  Illegal include: "android_webview/native/aw_contents.h"
    Because of "-android_webview" from android_webview/browser's include_rules.

Original issue's description:
> Add AwAssets into android_webview/native/public
>
> This is done so that android_webview/browser doesn't need to depend on
> android_webview/native
>
> BUG=459779
>
> Committed: https://crrev.com/a08360b39730751c5f85797bdff5b748d907c11a
> Cr-Commit-Position: refs/heads/master@{#317475}

TBR=boliu@chromium.org,sgurun@chromium.org,hush@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=459779
Committed: https://crrev.com/34cd1a9f17f7b4509753b0184e7ac3463ab43d13
Cr-Commit-Position: refs/heads/master@{#317567}

[binjin, 2015-02-23 11:19:59]

Created Revert of Add AwAssets into android_webview/native/public

[commit-bot: I haz the power, 2015-02-23 11:20:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/947113002/1

[commit-bot: I haz the power, 2015-02-23 11:21:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-23 11:21:56]

Patchset 1 (id:??) landed as
https://crrev.com/34cd1a9f17f7b4509753b0184e7ac3463ab43d13
Cr-Commit-Position: refs/heads/master@{#317567}

[hush (inactive), 2015-02-26 18:57:07]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/957423002/ by hush@chromium.org.

The reason for reverting is: https://codereview.chromium.org/950973003/ is just
landed to fix the deps problem..