Use a direct include of time headers in base/, part 1.

base/metrics/histogram_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.
 
 // Test of Histogram class
 
 #include <climits>
 #include <algorithm>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/metrics/bucket_ranges.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sample_vector.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/pickle.h"
-#include "base/time.h"
+#include "base/time/time.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 using std::vector;
 
 namespace base {
 
 class HistogramTest : public testing::Test {
  protected:
   virtual void SetUp() {
     // Each test will have a clean state (no Histogram / BucketRanges
@@ skipping 455 matching lines @@
   // CustomHistogram needs at least 1 valid range.
   custom_ranges.clear();
   custom_ranges.push_back(0);
   EXPECT_DEATH(CustomHistogram::FactoryGet("BadRangesCustom3", custom_ranges,
                                            HistogramBase::kNoFlags),
                "");
 }
 #endif
 
 }  // namespace base