Even more virtual method deinlining.

chrome/common/metrics_helpers.h

 // Copyright (c) 2010 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.
 
 // This file defines a set of user experience metrics data recorded by
 // the MetricsService.  This is the unit of data that is sent to the server.
 
 #ifndef CHROME_COMMON_METRICS_HELPERS_H_
 #define CHROME_COMMON_METRICS_HELPERS_H_
 #pragma once
@@ skipping 81 matching lines @@
   // The value is used to identify when a new build is run, so that previous
   // reliability stats, from other builds, can be abandoned.
   static int64 GetBuildTime();
 
   // Use |extension| in all uploaded appversions in addition to the standard
   // version string.
   static void set_version_extension(const std::string& extension) {
     version_extension_ = extension;
   }
 
-  virtual MetricsLog* AsMetricsLog() {
-    return NULL;
-  }
+  virtual MetricsLog* AsMetricsLog();
 
  protected:
   class XmlWrapper;
 
   // Returns a string containing the current time.
   // Virtual so that it can be overridden for testing.
   virtual std::string GetCurrentTimeString();
   // Helper class that invokes StartElement from constructor, and EndElement
   // from destructor.
   //
@@ skipping 153 matching lines @@
       const base::Histogram& histogram,
       const base::Histogram::SampleSet& snapshot);
   virtual void InconsistencyDetected(int problem);
   virtual void UniqueInconsistencyDetected(int problem);
   virtual void SnapshotProblemResolved(int amount);
 
   DISALLOW_COPY_AND_ASSIGN(MetricsServiceBase);
 };
 
 #endif  // CHROME_COMMON_METRICS_HELPERS_H_