Keep only base/extractor.[cc|h].

base/cgi.h

-// Copyright 2009 Google Inc.
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-// ========================================================================
-
-#ifndef OMAHA_COMMON_CGI_H__
-#define OMAHA_COMMON_CGI_H__
-
-#include <tchar.h>
-
-namespace omaha {
-
-class CGI {
- public:
-  // Maximum factor by which EscapeString() can increase the string length
-  static const int kEscapeFactor = 3;
-
-  // EscapeString() converts funky characters found in "src[0,srcn-1]" into
-  // escape sequences.  The escaped string is placed back in "dst".  At most
-  // "dstn" characters are written into "dst", including the
-  // null-termination byte.  Returns true if
-  // successful, false if the escaped string will not fit entirely in "dstn"
-  // characters.  Since escaping can increase the length, "dst" should not
-  // be the same as "src".
-
-  // These functions always return a null-terminated string, even if they
-  // fail (e.g. if a bad escape sequence is found).  As a consequence, you
-  // must pass in a dstn > 0.
-  // If you want to guarantee that the result will fit, you need
-  //      dstn >= kEscapeFactor * srcn + 1
-  // for EscapeString and
-  //      dstn >= srcn + 1
-  // for UnescapeString.
-
-  static bool EscapeString(const TCHAR* src, int srcn, TCHAR* dst, int dstn);
-  static bool UnescapeString(const TCHAR* src, int srcn, TCHAR* dst, int dstn);
-};
-
-}  // namespace omaha
-
-#endif  // OMAHA_COMMON_CGI_H__