Revert "Skip rewriting headers that reference SkM44.h until we can remove the private copy of it"

This reverts commit 09a73000ea.

include/private/SkM44.h is gone, so we can undo this hack

Change-Id: I770063c8468ad7f4c51fa41ca407e4655c90c15f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/273457
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>

tools/rewrite_includes.py

@@ -51,7 +51,7 @@ for root in roots:
   for path, _, files in os.walk(root):
     if not any(snippet in fix_path(path) for snippet in ignorelist):
       for file_name in files:
-        if file_name.endswith('.h') and 'SkM44' not in file_name:
+        if file_name.endswith('.h'):
           if file_name in headers:
             print path, file_name, headers[file_name]
           assert file_name not in headers