Revert of Added BookmarkClient::CanBeEditedByUser.

Revert of Added BookmarkClient::CanBeEditedByUser. (https://codereview.chromium.org/317333004/)

Reason for revert:
http://crbug.com/381921

Original issue's description:
> Added BookmarkClient::CanBeEditedByUser.
> 
> CanBeEditedByUser indicates if a bookmark can be edited by the user or not.
> All of the bookmarks in the bookmark_bar_node, the other_node and the
> mobile_node are always editable but some of the extra nodes provided by the
> client may be unmodifiable.
> 
> Also updated other methods to work only with user-editable nodes, and added
> utility helpers to detect nodes that can or can't be edited.
> 
> BUG=49598
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=275523

TBR=sky@chromium.org,joaodasilva@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=49598

[Kibeom Kim (inactive), 2014-06-06 22:27:25]

Created Revert of Added BookmarkClient::CanBeEditedByUser.

[commit-bot: I haz the power, 2014-06-06 22:28:50]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/kkimlabs@chromium.org/312093007/1

[commit-bot: I haz the power, 2014-06-06 22:28:50]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-06 22:28:51]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.