Linux: Revert updating PRIMARY selection on Ctrl-C in omnibox.

Linux: Revert updating PRIMARY selection on Ctrl-C in omnibox.

This backs out r23596.  I'm pretty sure that it worked when I tested it
right before submitting, but it's totally breaking stuff now -- it looks
like when I update the PRIMARY selection, GTK notices that it's lost the
selection and automatically unhighlights the text in the omnibox, making
it impossible to use Ctrl-C to copy omnibox text to the clipboard. :-(

BUG=19648
TESTED=Hit Ctrl-L, Ctrl-C and confirmed that text remains highlighted and becomes CLIPBOARD selection.

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=23714

[Evan Martin, 2009-08-19 15:57:05]

OK