Update from https://crrev.com/320343

base/debug/leak_annotations.h

 // Copyright (c) 2011 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 BASE_DEBUG_LEAK_ANNOTATIONS_H_
 #define BASE_DEBUG_LEAK_ANNOTATIONS_H_
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 
 // This file defines macros which can be used to annotate intentional memory
 // leaks. Support for annotations is implemented in LeakSanitizer. Annotated
 // objects will be treated as a source of live pointers, i.e. any heap objects
 // reachable by following pointers from an annotated object will not be
 // reported as leaks.
 //
 // ANNOTATE_SCOPED_MEMORY_LEAK: all allocations made in the current scope
 // will be annotated as leaks.
 // ANNOTATE_LEAKING_OBJECT_PTR(X): the heap object referenced by pointer X will
 // be annotated as a leak.
 
 #if defined(LEAK_SANITIZER) && !defined(OS_NACL)
 
-// Public LSan API from <sanitizer/lsan_interface.h>.
-extern "C" {
-void __lsan_disable();
-void __lsan_enable();
-void __lsan_ignore_object(const void *p);
-
-// Invoke leak detection immediately. If leaks are found, the process will exit.
-void __lsan_do_leak_check();
-}  // extern "C"
+#include <sanitizer/lsan_interface.h>
 
 class ScopedLeakSanitizerDisabler {
  public:
   ScopedLeakSanitizerDisabler() { __lsan_disable(); }
   ~ScopedLeakSanitizerDisabler() { __lsan_enable(); }
  private:
   DISALLOW_COPY_AND_ASSIGN(ScopedLeakSanitizerDisabler);
 };
 
 #define ANNOTATE_SCOPED_MEMORY_LEAK \
     ScopedLeakSanitizerDisabler leak_sanitizer_disabler; static_cast<void>(0)
 
 #define ANNOTATE_LEAKING_OBJECT_PTR(X) __lsan_ignore_object(X);
 
 #else
 
-// If neither HeapChecker nor LSan are used, the annotations should be no-ops.
 #define ANNOTATE_SCOPED_MEMORY_LEAK ((void)0)
 #define ANNOTATE_LEAKING_OBJECT_PTR(X) ((void)0)
 
 #endif
 
 #endif  // BASE_DEBUG_LEAK_ANNOTATIONS_H_