chromeos: Replace --disable-stub-ethernet with --enabled-stub-network-types

--enabled-stub-network-types provides a more flexible way to test network connection related UI.

Examples:
Disable all networks: --enabled-stub-network-types=''
Wifi only: --enabled-stub-network-types=wifi
Ethernet and Wifi: --enabled-stub-network-types=ethernet,wifi
Enable all networks: Launch without --enabled-stub-network-types

BUG=325103

Review URL: https://codereview.chromium.org/99453006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241172 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241172
Disable platform verification in incognito or guest mode.

Manual tests pass and a unit test is forthcoming as per
crbug.com/328539.

BUG=chromium:328201
TEST=manual

TBR=mnissler@chromium.org

Review URL: https://codereview.chromium.org/99873008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241173 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241173
Added list of forced starting URLs to precache configuration settings.

BUG=306185

Review URL: https://codereview.chromium.org/103373006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241174 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241174
Valgrind: Remove suppressions for a fixed WebCore::CSSParser leak.

BUG=241892
TBR=ericwilligers@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/103473006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@241175 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 241175