Better keyboard and mouse handling in Omnibox:

- Grab enter key events before they get to GtkTextView.
  We need to do this, otherwise enter when text is selected
  will replace the text, and we won't get a chance to catch
  that happening.  This might have problems with IME, but it
  should be straightforward to fix anything IME related.

- Don't deselect when we lose focus.  This sometimes looks a
  bit strange, but it's the GTK thing to do.  This also unbreaks
  copy and paste via the context menu, since popping up the
  context menu makes the GtkTextView lose focus.

- Rewrite the inefficent newline eater.  This should now only be
  needed for newlines that didn't come from the keyboard (like when
  you paste text).  Use the builtin iter support for finding line
  boundaries, hopefully more efficient than checking the characters
  one by one.  Still might have some bad behavior when pasting a ton
  of newline characters, but that can be improved later.

This fixes inline autocomplete, you can now hit the enter key on an
inline autocompleted suggestion, and you will get the intented navigation,
instead of the navigation with the selected completion removed.

This also adds support for alt-enter in Omnibox to navigate in a new tab.

BUG=8236

Review URL: http://codereview.chromium.org/43072


git-svn-id: svn://svn.chromium.org/chrome/trunk/src@11527 0039d316-1c4b-4281-b951-d872f2087c98

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