Update from https://crrev.com/306655

net/http/http_cache_transaction.cc

Index: net/http/http_cache_transaction.cc
diff --git a/net/http/http_cache_transaction.cc b/net/http/http_cache_transaction.cc
index 896db76e1586ab01e41e74120ba83da8b6017633..23fb2d19b5e77b8691bc020d826f29046b60d11a 100644
--- a/net/http/http_cache_transaction.cc
+++ b/net/http/http_cache_transaction.cc
@@ -2883,15 +2883,16 @@ void HttpCache::Transaction::RecordHistograms() {
   }
 
   TimeDelta before_send_time = send_request_since_ - first_cache_access_since_;
-  int before_send_percent =
-      total_time.ToInternalValue() == 0 ? 0
-                                        : before_send_time * 100 / total_time;
-  DCHECK_LE(0, before_send_percent);
-  DCHECK_GE(100, before_send_percent);
+  int64 before_send_percent = (total_time.ToInternalValue() == 0) ?
+      0 : before_send_time * 100 / total_time;
+  DCHECK_GE(before_send_percent, 0);
+  DCHECK_LE(before_send_percent, 100);
+  base::HistogramBase::Sample before_send_sample =
+      static_cast<base::HistogramBase::Sample>(before_send_percent);
 
   UMA_HISTOGRAM_TIMES("HttpCache.AccessToDone.SentRequest", total_time);
   UMA_HISTOGRAM_TIMES("HttpCache.BeforeSend", before_send_time);
-  UMA_HISTOGRAM_PERCENTAGE("HttpCache.PercentBeforeSend", before_send_percent);
+  UMA_HISTOGRAM_PERCENTAGE("HttpCache.PercentBeforeSend", before_send_sample);
 
   // TODO(gavinp): Remove or minimize these histograms, particularly the ones
   // below this comment after we have received initial data.
@@ -2900,25 +2901,25 @@ void HttpCache::Transaction::RecordHistograms() {
       UMA_HISTOGRAM_TIMES("HttpCache.BeforeSend.CantConditionalize",
                           before_send_time);
       UMA_HISTOGRAM_PERCENTAGE("HttpCache.PercentBeforeSend.CantConditionalize",
-                               before_send_percent);
+                               before_send_sample);
       break;
     }
     case PATTERN_ENTRY_NOT_CACHED: {
       UMA_HISTOGRAM_TIMES("HttpCache.BeforeSend.NotCached", before_send_time);
       UMA_HISTOGRAM_PERCENTAGE("HttpCache.PercentBeforeSend.NotCached",
-                               before_send_percent);
+                               before_send_sample);
       break;
     }
     case PATTERN_ENTRY_VALIDATED: {
       UMA_HISTOGRAM_TIMES("HttpCache.BeforeSend.Validated", before_send_time);
       UMA_HISTOGRAM_PERCENTAGE("HttpCache.PercentBeforeSend.Validated",
-                               before_send_percent);
+                               before_send_sample);
       break;
     }
     case PATTERN_ENTRY_UPDATED: {
       UMA_HISTOGRAM_TIMES("HttpCache.BeforeSend.Updated", before_send_time);
       UMA_HISTOGRAM_PERCENTAGE("HttpCache.PercentBeforeSend.Updated",
-                               before_send_percent);
+                               before_send_sample);
       break;
     }
     default: