Add 'requests' library to third_party.

third_party/requests/packages/charade/charsetprober.py

Index: third_party/requests/packages/charade/charsetprober.py
diff --git a/third_party/requests/packages/charade/charsetprober.py b/third_party/requests/packages/charade/charsetprober.py
new file mode 100644
index 0000000000000000000000000000000000000000..97581712c1c2cfd31f89f396be24b27f657e1dd6
--- /dev/null
+++ b/third_party/requests/packages/charade/charsetprober.py
@@ -0,0 +1,62 @@
+######################## BEGIN LICENSE BLOCK ########################
+# The Original Code is Mozilla Universal charset detector code.
+#
+# The Initial Developer of the Original Code is
+# Netscape Communications Corporation.
+# Portions created by the Initial Developer are Copyright (C) 2001
+# the Initial Developer. All Rights Reserved.
+#
+# Contributor(s):
+#   Mark Pilgrim - port to Python
+#   Shy Shalom - original C code
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
+# 02110-1301  USA
+######################### END LICENSE BLOCK #########################
+
+from . import constants
+import re
+
+
+class CharSetProber:
+    def __init__(self):
+        pass
+
+    def reset(self):
+        self._mState = constants.eDetecting
+
+    def get_charset_name(self):
+        return None
+
+    def feed(self, aBuf):
+        pass
+
+    def get_state(self):
+        return self._mState
+
+    def get_confidence(self):
+        return 0.0
+
+    def filter_high_bit_only(self, aBuf):
+        aBuf = re.sub(b'([\x00-\x7F])+', b' ', aBuf)
+        return aBuf
+
+    def filter_without_english_letters(self, aBuf):
+        aBuf = re.sub(b'([A-Za-z])+', b' ', aBuf)
+        return aBuf
+
+    def filter_with_english_letters(self, aBuf):
+        # TODO
+        return aBuf