Remove relative includes.

third_party/base/numerics/safe_math_impl.h

 // Copyright 2014 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 PDFIUM_THIRD_PARTY_SAFE_MATH_IMPL_H_
 #define PDFIUM_THIRD_PARTY_SAFE_MATH_IMPL_H_
 
 #include <stdint.h>
 
 #include <cmath>
 #include <cstdlib>
 #include <limits>
 
-#include "../macros.h"
-#include "../template_util.h"
 #include "safe_conversions.h"
+#include "third_party/base/macros.h"
+#include "third_party/base/template_util.h"
 
 namespace pdfium {
 namespace base {
 namespace internal {
 
 // Everything from here up to the floating point operations is portable C++,
 // but it may not be fast. This code could be split based on
 // platform/architecture and replaced with potentially faster implementations.
 
 // Integer promotion templates used by the portable checked integer arithmetic.
@@ skipping 468 matching lines @@
                             StaticDstRangeRelationToSrcRange<T, Rhs>::value !=
                                 NUMERIC_RANGE_CONTAINED &&
                             sizeof(T) >= (2 * sizeof(Rhs));
 };
 
 }  // namespace internal
 }  // namespace base
 }  // namespace pdfium
 
 #endif  // PDFIUM_THIRD_PARTY_SAFE_MATH_IMPL_H_