Revert 63397 - Add a message pump for touchui=1...

Revert 63397 - Add a message pump for touchui=1

The message pump reads events directly from X. For most events, it passes them
on to GDK for normal processing. It consumes some events (e.g. keypress events)
to demonstrate how it's intended to work. This, of course, makes chrome mostly
unusable since you can only use the mouse to do things. But this is a small
first step towards capturing events through MPX (e.g. touch etc.) and processing
them as chrome pleases.

glib message pump: Slightly change architecture

This changeset breaks down the glib message pump a little so that it can be
easily subclassed. The next set of commits will introduce a subclass that still
uses GTK and GDK widgets, but reads events directly from X instead of through
GTK/GDK.

Review URL: http://codereview.chromium.org/3748002
Patch from Sadrul Chowdhury <sadrul@chromium.org>;.

TBR=rjkroege@google.com

Probably a dynamic link problem with -lX11.



Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=63403