Fix more disabled MSVC warnings, base/ edition.

base/metrics/histogram.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.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 // See header file for details and examples.
 
 #include "base/metrics/histogram.h"
@@ skipping 110 matching lines @@
     return NULL;
   }
   return histogram;
 }
 
 HistogramBase* Histogram::FactoryTimeGet(const string& name,
                                          TimeDelta minimum,
                                          TimeDelta maximum,
                                          size_t bucket_count,
                                          int32 flags) {
-  return FactoryGet(name, minimum.InMilliseconds(), maximum.InMilliseconds(),
-                    bucket_count, flags);
+  return FactoryGet(name, static_cast<Sample>(minimum.InMilliseconds()),
+                    static_cast<Sample>(maximum.InMilliseconds()), bucket_count,
+                    flags);
 }
 
 // Calculate what range of values are held in each bucket.
 // We have to be careful that we don't pick a ratio between starting points in
 // consecutive buckets that is sooo small, that the integer bounds are the same
 // (effectively making one bucket get no values).  We need to avoid:
 //   ranges(i) == ranges(i + 1)
 // To avoid that, we just do a fine-grained bucket width as far as we need to
 // until we get a ratio that moves us along at least 2 units at a time.  From
 // that bucket onward we do use the exponential growth of buckets.
@@ skipping 378 matching lines @@
                                            int32 flags) {
   return FactoryGetWithRangeDescription(
       name, minimum, maximum, bucket_count, flags, NULL);
 }
 
 HistogramBase* LinearHistogram::FactoryTimeGet(const string& name,
                                                TimeDelta minimum,
                                                TimeDelta maximum,
                                                size_t bucket_count,
                                                int32 flags) {
-  return FactoryGet(name, minimum.InMilliseconds(), maximum.InMilliseconds(),
-                    bucket_count, flags);
+  return FactoryGet(name, static_cast<Sample>(minimum.InMilliseconds()),
+                    static_cast<Sample>(maximum.InMilliseconds()), bucket_count,
+                    flags);
 }
 
 HistogramBase* LinearHistogram::FactoryGetWithRangeDescription(
       const std::string& name,
       Sample minimum,
       Sample maximum,
       size_t bucket_count,
       int32 flags,
       const DescriptionPair descriptions[]) {
   bool valid_arguments = Histogram::InspectConstructionArguments(
@@ skipping 292 matching lines @@
 
   BucketRanges* bucket_ranges = new BucketRanges(ranges.size());
   for (size_t i = 0; i < ranges.size(); i++) {
     bucket_ranges->set_range(i, ranges[i]);
   }
   bucket_ranges->ResetChecksum();
   return bucket_ranges;
 }
 
 }  // namespace base