Fixes for re-enabling more MSVC level 4 warnings: chrome/browser/ edition

chrome/browser/spellchecker/spellcheck_host_metrics.cc

 // Copyright (c) 2011 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 "chrome/browser/spellchecker/spellcheck_host_metrics.h"
 
 #include "base/md5.h"
 #include "base/metrics/histogram.h"
 
 SpellCheckHostMetrics::SpellCheckHostMetrics()
@@ skipping 21 matching lines @@
 void SpellCheckHostMetrics::RecordCustomWordCountStats(size_t count) {
   UMA_HISTOGRAM_COUNTS("SpellCheck.CustomWords", count);
 }
 
 void SpellCheckHostMetrics::RecordEnabledStats(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("SpellCheck.Enabled", enabled);
   // Because SpellCheckHost is instantiated lazily, the size of
   // custom dictionary is unknown at this time. We mark it as -1 and
   // record actual value later. See SpellCheckHost for more detail.
   if (enabled)
-    RecordCustomWordCountStats(-1);
+    RecordCustomWordCountStats(static_cast<size_t>(-1));
 }
 
 void SpellCheckHostMetrics::RecordCheckedWordStats(const base::string16& word,
                                                    bool misspell) {
   spellchecked_word_count_++;
   if (misspell) {
     misspelled_word_count_++;
     // If an user misspelled, that user should be counted as a part of
     // the population.  So we ensure to instantiate the histogram
     // entries here at the first time.
@@ skipping 85 matching lines @@
   if (suggestion_show_count_ != last_suggestion_show_count_) {
     DCHECK(suggestion_show_count_ > last_suggestion_show_count_);
     UMA_HISTOGRAM_COUNTS("SpellCheck.ShownSuggestions", suggestion_show_count_);
     last_suggestion_show_count_ = suggestion_show_count_;
   }
 }
 
 void SpellCheckHostMetrics::RecordSpellingServiceStats(bool enabled) {
   UMA_HISTOGRAM_BOOLEAN("SpellCheck.SpellingService.Enabled", enabled);
 }