Replace string 'Misbehaving extension' with 'Extension error' in context of the webRequest API

The string 'Misbehaving extension' indicated that the extension author did
something wrong, even though the problem might be related to a conflicting
modification of two webRequest API extensions. It is neither extension's fault,
they are just incompatible.

BUG=111700
TEST=no

Review URL: https://chromiumcodereview.appspot.com/9664060

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@127663 0039d316-1c4b-4281-b951-d872f2087c98
1 file changed