Disk cache: fix broken UMA reports.

net/disk_cache/stats.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef NET_DISK_CACHE_STATS_H_
 #define NET_DISK_CACHE_STATS_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 25 matching lines @@
     INVALID_ENTRY,
     OPEN_ENTRIES,  // Average number of open entries.
     MAX_ENTRIES,  // Maximum number of open entries.
     TIMER,
     READ_DATA,
     WRITE_DATA,
     OPEN_RANKINGS,  // An entry has to be read just to modify rankings.
     GET_RANKINGS,  // We got the ranking info without reading the whole entry.
     FATAL_ERROR,
     LAST_REPORT,  // Time of the last time we sent a report.
-    LAST_REPORT_TIMER,  // Timer count since last report.
+    LAST_REPORT_TIMER,  // Timer count of the last time we sent a report.
     MAX_COUNTER
   };
 
   Stats() : backend_(NULL) {}
   ~Stats();
 
   bool Init(BackendImpl* backend, uint32* storage_addr);
 
   // Tracks changes to the stoage space used by an entry.
   void ModifyStorageStats(int32 old_size, int32 new_size);
@@ skipping 28 matching lines @@
   int data_sizes_[kDataSizesLength];
   int64 counters_[MAX_COUNTER];
   scoped_ptr<StatsHistogram> size_histogram_;
 
   DISALLOW_COPY_AND_ASSIGN(Stats);
 };
 
 }  // namespace disk_cache
 
 #endif  // NET_DISK_CACHE_STATS_H_