Revert of [android_webview] Move the glue layer into android_webview/…

…glue (patchset chromium#1 id:1 of https://codereview.chromium.org/784973004/)

Reason for revert:
Causing failures in Linux perf bots.

See
https://code.google.com/p/chromium/issues/detail?id=440895 for details.

Original issue's description:
> [android_webview] Move the glue layer into android_webview/glue
>
> This checks in a copy of the WebView glue layer from master-chromium
> at revision d519b07bd3cb09b571689b00250cb5de977b4dfc.
> Changes to make the code adhere to the style guide, fix up warnigns
> and actually switch over to this from the copy in third_party will
> be made as subsequent CLs.
>
> BUG=440792
> TEST=None
> R=torne@chromium.org
>
> Committed: https://chromium.googlesource.com/chromium/src/+/d6d785aa0b13b649dfa27b1707ea93b9553640c9

TBR=torne@chromium.org,mkosiba@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=440792

Review URL: https://codereview.chromium.org/792133002

Cr-Commit-Position: refs/heads/master@{#307744}