Cleanup dead code in base/ as found by Scythe.

base/process/process_metrics.h

 // Copyright (c) 2013 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 contains routines for gathering resource statistics for processes
 // running on the system.
 
 #ifndef BASE_PROCESS_PROCESS_METRICS_H_
 #define BASE_PROCESS_PROCESS_METRICS_H_
 
@@ skipping 67 matching lines @@
 //          pagefile.sys)
 // image:   These pages are mapped into the view of an image section (backed by
 //          file system)
 struct CommittedKBytes {
   CommittedKBytes() : priv(0), mapped(0), image(0) {}
   size_t priv;
   size_t mapped;
   size_t image;
 };
 
-// Free memory (Megabytes marked as free) in the 2G process address space.
-// total : total amount in megabytes marked as free. Maximum value is 2048.
-// largest : size of the largest contiguous amount of memory found. It is
-//   always smaller or equal to FreeMBytes::total.
-// largest_ptr: starting address of the largest memory block.
-struct FreeMBytes {
-  size_t total;
-  size_t largest;
-  void* largest_ptr;
-};
-
 // Convert a POSIX timeval to microseconds.
 BASE_EXPORT int64 TimeValToMicroseconds(const struct timeval& tv);
 
 // Provides performance metrics for a specified process (CPU usage, memory and
 // IO counters). To use it, invoke CreateProcessMetrics() to get an instance
 // for a specific process, then access the information with the different get
 // methods.
 class BASE_EXPORT ProcessMetrics {
  public:
   ~ProcessMetrics();
@@ skipping 277 matching lines @@
   SystemDiskInfo disk_info_;
 #endif
 #if defined(OS_CHROMEOS)
   SwapInfo swap_info_;
 #endif
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_PROCESS_METRICS_H_