Fix a typo. It will cause crash when client uses a histogram with bad maximum.

base/metrics/histogram.cc

Index: base/metrics/histogram.cc
===================================================================
--- base/metrics/histogram.cc	(revision 149495)
+++ base/metrics/histogram.cc	(working copy)
@@ -458,12 +458,12 @@
                                              size_t* bucket_count) {
   // Defensive code for backward compatibility.
   if (*minimum < 1) {
-    DLOG(WARNING) << "Histogram: " << name << " Bad minimum: " << *minimum;
+    DVLOG(1) << "Histogram: " << name << " has bad minimum: " << *minimum;
     *minimum = 1;
   }
   if (*maximum >= kSampleType_MAX) {
-    DLOG(WARNING) << "Histogram: " << name << " Bad maximum: " << *maximum;
-    *maximum = kSampleType_MAX;
+    DVLOG(1) << "Histogram: " << name << " has bad maximum: " << *maximum;
+    *maximum = kSampleType_MAX - 1;
   }
 
   if (*bucket_count < 3 || *bucket_count >= kBucketCount_MAX)