Remove a bunch of cruft from //build.

build/linux/chrome_linux.croc

-# -*- python -*-
-# Crocodile config file for Chromium linux
-
-# TODO(jhawkins): We'll need to add a chromeos.croc once we get a coverage bot
-# for that platform.
-
-{
-  # List of rules, applied in order
-  'rules' : [
-    # Specify inclusions before exclusions, since rules are in order.
-
-    # Don't include non-Linux platform dirs
-    {
-      'regexp' : '.*/(chromeos|views)/',
-      'include' : 0,
-    },
-    # Don't include chromeos, windows, or mac specific files
-    {
-      'regexp' : '.*(_|/)(chromeos|mac|win|views)(\\.|_)',
-      'include' : 0,
-    },
-
-    # Groups
-    {
-      'regexp' : '.*_test_linux\\.',
-      'group' : 'test',
-    },
-  ],
-}