Remove references to sconsbuild.

scons hasn't been used in a long time.

Also remove support for using make on Mac, it's no longer supported. All bots
that were using make on mac are using ninja these days.

BUG=305702

Review URL: https://codereview.chromium.org/26672003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@227778 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_support.py

@@ -243,7 +243,7 @@ class InputApi(object):
       r".*\bDebug[\\\/].*",
       r".*\bRelease[\\\/].*",
       r".*\bxcodebuild[\\\/].*",
-      r".*\bsconsbuild[\\\/].*",
+      r".*\bout[\\\/].*",
       # All caps files like README and LICENCE.
       r".*\b[A-Z0-9_]{2,}$",
       # SCM (can happen in dual SCM configuration). (Slightly over aggressive)