bookmarks: Extract PerformBookmarkDrop() function out of bookmark_utils.h

bookmarks: Extract PerformBookmarkDrop() function out of bookmark_utils.h

We do a couple of things in this patch:

- Move PerformBookmarkDrop() function into c/b/ui/bookmarks/bookmark_drag_drop
- Rename to DropBookmarks, so it pairs with DragBookmarks
- Along the way platform specific files had to be renamed to not conflict with
the new cross-platform bookmark_drag_drop.cc file added.

BUG=144783
R=sky@chromium.org


Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=188824

[tfarina, 2013-03-15 23:25:41]

Scott, the file renames here were due to this error:

static library /home/tfarina/chromium/src/chrome/chrome.gyp:browser_ui#target
has several files with the same basename:
  bookmark_drag_drop: browser/ui/bookmarks/bookmark_drag_drop.cc
browser/ui/gtk/bookmarks/bookmark_drag_drop.cc
Some build systems, e.g. MSVC08, cannot handle that.
gyp: Duplicate basenames in sources section, see list above

Please, have a look.

Thanks,

[sky, 2013-03-18 15:52:38]

LGTM

[commit-bot: I haz the power, 2013-03-18 18:42:03]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/tfarina@chromium.org/12475013/7001

[commit-bot: I haz the power, 2013-03-18 21:21:32]

Change committed as 188824