<webview>: Reuse GuestViewBase::HandleKeyboardEvent code.

<webview>: Reuse GuestViewBase::HandleKeyboardEvent code.

<webview> has its own implementation of HandleKeyboardEvent that deals with back/forward keys
and so on but for keys it doesn't know how to handle, it should pass them along as other
GuestViews do.

This CL also moves WebContentsObserver and WebContentsDelegate overrides in GuestViewBase from private to protected.

BUG=none

Committed: https://crrev.com/4a1650ffd40fb4b042d2004b938f2442ccafcec9
Cr-Commit-Position: refs/heads/master@{#312938}

[Fady Samuel, 2015-01-23 19:55:21]

fsamuel@chromium.org changed reviewers:
+ lazyboy@chromium.org

[lazyboy, 2015-01-23 20:08:01]

lgtm

https://codereview.chromium.org/869193004/diff/1/extensions/browser/guest_vie...
File extensions/browser/guest_view/guest_view_base.h (right):

https://codereview.chromium.org/869193004/diff/1/extensions/browser/guest_vie...
extensions/browser/guest_view/guest_view_base.h:299: // WebContentsObserver
implementation.
Also note this private->public changes to overridden methods in the CL
description.

[Fady Samuel, 2015-01-23 20:13:22]

https://codereview.chromium.org/869193004/diff/1/extensions/browser/guest_vie...
File extensions/browser/guest_view/guest_view_base.h (right):

https://codereview.chromium.org/869193004/diff/1/extensions/browser/guest_vie...
extensions/browser/guest_view/guest_view_base.h:299: // WebContentsObserver
implementation.
On 2015/01/23 20:08:01, lazyboy wrote:
> Also note this private->public changes to overridden methods in the CL
> description.

Done. CQ'ing now.

[Fady Samuel, 2015-01-23 20:13:24]

The CQ bit was checked by fsamuel@chromium.org

[commit-bot: I haz the power, 2015-01-23 20:14:18]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/869193004/1

[commit-bot: I haz the power, 2015-01-23 21:58:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-23 21:59:08]

Patchset 1 (id:??) landed as
https://crrev.com/4a1650ffd40fb4b042d2004b938f2442ccafcec9
Cr-Commit-Position: refs/heads/master@{#312938}