Migrate chrome/browser files to histogram_macros.h includes.

chrome/browser/plugins/plugin_observer.cc

 // Copyright (c) 2012 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/plugins/plugin_observer.h"
 
 #include <utility>
 
 #include "base/auto_reset.h"
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/memory/ptr_util.h"
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/infobars/infobar_service.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chrome/browser/plugins/plugin_finder.h"
 #include "chrome/browser/plugins/plugin_infobar_delegates.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tab_modal_confirm_dialog.h"
@@ skipping 438 matching lines @@
       IDR_INFOBAR_PLUGIN_CRASHED,
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
       gfx::VectorIconId::EXTENSION_CRASHED,
 #else
       gfx::VectorIconId::VECTOR_ICON_NONE,
 #endif
       l10n_util::GetStringFUTF16(IDS_PLUGIN_INITIALIZATION_ERROR_PROMPT,
                                  plugin_name),
       true);
 }