Convert enable_plugins to a buildflag header.

chrome/browser/metrics/metrics_memory_details.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/metrics/metrics_memory_details.h"
 
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/location.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "components/nacl/common/nacl_process_type.h"
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/content_constants.h"
 #include "content/public/common/process_type.h"
+#include "ppapi/features/features.h"
 
 MemoryGrowthTracker::MemoryGrowthTracker() {
 }
 
 MemoryGrowthTracker::~MemoryGrowthTracker() {
 }
 
 bool MemoryGrowthTracker::UpdateSample(base::ProcessId pid,
                                        int sample,
                                        int* diff) {
@@ skipping 104 matching lines @@
         other_count++;
         continue;
       case content::PROCESS_TYPE_SANDBOX_HELPER:
         UMA_HISTOGRAM_MEMORY_KB("Memory.SandboxHelper", sample);
         other_count++;
         continue;
       case content::PROCESS_TYPE_GPU:
         UMA_HISTOGRAM_MEMORY_KB("Memory.Gpu", sample);
         other_count++;
         continue;
-#if defined(ENABLE_PLUGINS)
+#if BUILDFLAG(ENABLE_PLUGINS)
       case content::PROCESS_TYPE_PPAPI_PLUGIN: {
         const std::vector<base::string16>& titles =
             browser.processes[index].titles;
         if (titles.size() == 1 &&
             titles[0] == base::ASCIIToUTF16(content::kFlashPluginName)) {
           UMA_HISTOGRAM_MEMORY_KB("Memory.PepperFlashPlugin", sample);
         }
         UMA_HISTOGRAM_MEMORY_KB("Memory.PepperPlugin", sample);
         pepper_plugin_count++;
         continue;
@@ skipping 160 matching lines @@
         memory_growth_tracker_->UpdateSample(process_entry.pid, sample,
                                              &diff) &&
         generate_histograms_) {
       if (diff < 0)
         UMA_HISTOGRAM_MEMORY_KB("Memory.RendererShrinkIn30Min", -diff);
       else
         UMA_HISTOGRAM_MEMORY_KB("Memory.RendererGrowthIn30Min", diff);
     }
   }
 }