Update cursor when the mouse enters X root window.
This is speculative fix for 26684.

BUG=266854
TEST=covered by test. It's interactive_uitests because it depends on real X event.

Review URL: https://codereview.chromium.org/69783002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234632 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234632
linux: Lower si expectations by 1.

BUG=317171
TBR=erg

Review URL: https://codereview.chromium.org/70513003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234633 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234633
Make RootWindow not subclass Window.

Removes the #include of window.h from root_window.h too, which makes this CL a little longer bandaiding all those places.
The interesting parts of this change are in root_window.* and window.*

R=sky@chromium.org
http://crbug.com/308843

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=234428

Review URL: https://codereview.chromium.org/68313003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234634 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234634