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

base/tr_rand.h

-// Copyright 2004-2009 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.
-// ========================================================================
-//
-// Simple pseudo-random number generator.
-// Not intended for anything but random-to-humans numbers.
-// Very fast, and has a period of 32768 for all seed values (including zero).
-// Returns values in the range 0..0xFFFF (inclusive).
-//
-
-#ifndef OMAHA_COMMON_TR_RAND_H_
-#define OMAHA_COMMON_TR_RAND_H_
-
-namespace omaha {
-
-#define kMaximumRandomValue 65535
-
-// Same prototypes as CRT srand/rand
-void tr_srand(unsigned int seed);
-int tr_rand();
-
-}  // namespace omaha
-
-#endif  // OMAHA_COMMON_TR_RAND_H_