testserver.py: Remove log spam that would print on most requests.

The ShouldHandleRequest call in the handlers is just the
prefix matching, implementing a filter-chain pattern,
and failure is normal.

BUG=None
TBR=phajdan.jr@chromium.org

Review URL: https://codereview.chromium.org/700923003

Cr-Commit-Position: refs/heads/master@{#302692}

net/tools/testserver/testserver.py

@@ -1428,7 +1428,6 @@ class TestPageHandler(testserver_base.BasePageHandler):
 
     test_name = "/cross-site"
     if not self._ShouldHandleRequest(test_name):
-      print "CSRH: not handling request for " + test_name
       return False
 
     params = urllib.unquote(self.path[(len(test_name) + 1):])