Add explicit tests for histogram factory matching.

base/metrics/bucket_ranges_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/metrics/bucket_ranges.h"
 
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 namespace {
@@ skipping 55 matching lines @@
   ranges.set_range(2, 3);
   EXPECT_FALSE(ranges.HasValidChecksum());
 
   ranges.ResetChecksum();
   EXPECT_EQ(2843835776u, ranges.checksum());
   EXPECT_TRUE(ranges.HasValidChecksum());
 }
 
 // Table was generated similarly to sample code for CRC-32 given on:
 // http://www.w3.org/TR/PNG/#D-CRCAppendix.
-TEST(HistogramTest, Crc32TableTest) {
+TEST(BucketRangesTest, Crc32TableTest) {
   for (int i = 0; i < 256; ++i) {
     uint32 checksum = i;
     for (int j = 0; j < 8; ++j) {
       const uint32 kReversedPolynomial = 0xedb88320L;
       if (checksum & 1)
         checksum = kReversedPolynomial ^ (checksum >> 1);
       else
         checksum >>= 1;
     }
     EXPECT_EQ(kCrcTable[i], checksum);
   }
 }
 
 }  // namespace
 }  // namespace base