Switch to standard integer types in components/, part 4 of 4.

components/variations/synthetic_trials.h

 // 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.
 
 #ifndef COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_H_
 #define COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_H_
 
+#include <stdint.h>
+
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/time/time.h"
 #include "components/variations/active_field_trials.h"
 
 namespace variations {
 
 // A Field Trial and its selected group, which represent a particular
 // Chrome configuration state. For example, the trial name could map to
@@ skipping 14 matching lines @@
   virtual void OnSyntheticTrialsChanged(
       const std::vector<SyntheticTrialGroup>& groups) = 0;
 
  protected:
   virtual ~SyntheticTrialObserver() {}
 };
 
 }  // namespace variations
 
 #endif  // COMPONENTS_VARIATIONS_SYNTHETIC_TRIALS_H_