Small improvements to ErrorConsole UI
Don't display "view details" link if we have no visible stack trace and can't
load the code (there's no details to view!).
Contain the code within a nicer, flexible container.
BUG=21734

Review URL: https://codereview.chromium.org/150983006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249645 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249645
[Files.app] Remove the flag of flipping the webstore integration

The webstore integration with Files.app has been launched successfully, so we don't need the flag to flop anymore.

BUG=341320
TEST=none

Review URL: https://codereview.chromium.org/151913008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@249646 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 249646