Remove conflicting function declaration.

content/common/sandbox_linux/sandbox_linux.cc

Index: content/common/sandbox_linux/sandbox_linux.cc
diff --git a/content/common/sandbox_linux/sandbox_linux.cc b/content/common/sandbox_linux/sandbox_linux.cc
index 237cc89deb9947af3d96fe8753e641a7c907f07a..4d389b5e6de3b267c5d6ee10065e88f21551aa0c 100644
--- a/content/common/sandbox_linux/sandbox_linux.cc
+++ b/content/common/sandbox_linux/sandbox_linux.cc
@@ -34,6 +34,11 @@
 #include "sandbox/linux/services/yama.h"
 #include "sandbox/linux/suid/client/setuid_sandbox_client.h"
 
+#if (defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
+     defined(LEAK_SANITIZER))
+#include <sanitizer/common_interface_defs.h>
+#endif
+
 using sandbox::Yama;
 
 namespace {
@@ -124,12 +129,6 @@ LinuxSandbox* LinuxSandbox::GetInstance() {
   return instance;
 }
 
-#if (defined(ADDRESS_SANITIZER) || defined(MEMORY_SANITIZER) || \
-     defined(LEAK_SANITIZER))  && defined(OS_LINUX)
-// Sanitizer API call to notify the tool the sandbox is going to be turned on.
-extern "C" void __sanitizer_sandbox_on_notify(void *reserved);
-#endif
-
 void LinuxSandbox::PreinitializeSandbox() {
   CHECK(!pre_initialized_);
   seccomp_bpf_supported_ = false;