Change includes of histogram.h to histogram_macros.h.

content/browser/accessibility/browser_accessibility_state_impl_mac.mm

 // Copyright 2016 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 "content/browser/accessibility/browser_accessibility_state_impl.h"
 
 #import <Cocoa/Cocoa.h>
 
-#include "base/metrics/histogram.h"
+#include "base/metrics/histogram_macros.h"
 
 @interface NSWorkspace (Partials)
 
 @property(readonly) BOOL accessibilityDisplayShouldDifferentiateWithoutColor;
 @property(readonly) BOOL accessibilityDisplayShouldIncreaseContrast;
 @property(readonly) BOOL accessibilityDisplayShouldReduceTransparency;
 
 @end
 
 namespace content {
@@ skipping 15 matching lines @@
   UMA_HISTOGRAM_BOOLEAN(
       "Accessibility.Mac.ReduceTransparency",
       workspace.accessibilityDisplayShouldReduceTransparency);
 
   UMA_HISTOGRAM_BOOLEAN(
       "Accessibility.Mac.FullKeyboardAccessEnabled",
       static_cast<NSApplication*>(NSApp).fullKeyboardAccessEnabled);
 }
 
 }  // namespace content