[UMA] Remove redundant bucket_count variable from base::Histogram.

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 {
 
 TEST(BucketRangesTest, NormalSetup) {
   BucketRanges ranges(5);
   ASSERT_EQ(5u, ranges.size());
+  ASSERT_EQ(4u, ranges.bucket_count());
 
-  for (int i = 0; i < 5; i++) {
+  for (int i = 0; i < 5; ++i) {
     EXPECT_EQ(0, ranges.range(i));
   }
   EXPECT_EQ(0u, ranges.checksum());
 
   ranges.set_range(3, 100);
   EXPECT_EQ(100, ranges.range(3));
 }
 
 TEST(BucketRangesTest, Equals) {
   // Compare empty ranges.
@@ skipping 55 matching lines @@
         checksum = kReversedPolynomial ^ (checksum >> 1);
       else
         checksum >>= 1;
     }
     EXPECT_EQ(kCrcTable[i], checksum);
   }
 }
 
 }  // namespace
 }  // namespace base