Do not paste clipboard contents when middle click on a bookmark in Bookmark Manager.

Do not paste clipboard contents when middle click on a bookmark in Bookmark Manager.

Middle click on a bookmark in Bookmark Manager should open the bookmark in new
tab without pasting the contents of paste buffer. In Linux, since middle click
is used as 'paste', prevent it from pasting if the clicked item is a bookmark.
If clicked elsewhere in the Bookmark Manager window, do the default behaviour.

BUG=44811
R=bauerb@chromium.org

TEST=
1) Add few bookmarks and open Bookmark Manager.
2) Copy one or more bookmark item(s).
3) Middle click on a bookmark item and observe.
4) The clicked bookmark should open in new tab without pasting the copied bookmark
   inside the window.

Committed: https://crrev.com/233c5a88c8ad7fbaba83c7822e7d6ae10162cdef
Cr-Commit-Position: refs/heads/master@{#293382}

[Gaja, 2014-09-02 12:25:07]

PTAL.

[Gaja, 2014-09-04 12:25:41]

On 2014/09/02 12:25:07, Gajendra N wrote:
> PTAL.

@bauerb
PTAL.

[Bernhard Bauer, 2014-09-04 12:27:29]

LGTM!

[Gaja, 2014-09-04 12:27:58]

The CQ bit was checked by gajendra.n@samsung.com

[commit-bot: I haz the power, 2014-09-04 12:28:46]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/gajendra.n@samsung.com/527923002/1

[commit-bot: I haz the power, 2014-09-05 00:45:34]

Committed patchset #1 (id:1) as 80bb8e4c0a9658f664ae0a2101d24a4751275935

[commit-bot: I haz the power, 2014-09-10 03:34:20]

Patchset 1 (id:??) landed as
https://crrev.com/233c5a88c8ad7fbaba83c7822e7d6ae10162cdef
Cr-Commit-Position: refs/heads/master@{#293382}