Fix Android x64 build.

ipc/ipc_message_utils.h

Index: ipc/ipc_message_utils.h
diff --git a/ipc/ipc_message_utils.h b/ipc/ipc_message_utils.h
index ef32e0bd61c4e078649c685d84ab870a65c6a81d..942a4b79a000032a3382dce4968f7612724de3e4 100644
--- a/ipc/ipc_message_utils.h
+++ b/ipc/ipc_message_utils.h
@@ -193,7 +193,8 @@ struct ParamTraits<unsigned int> {
 //   3) Android 64 bit also has int64_t typedef'd to long.
 // Since we want to support Android 32<>64 bit IPC, as long as we don't have
 // these traits for 32 bit ARM then that'll catch any errors.
-#if defined(OS_WIN) || defined(OS_LINUX) || defined(ARCH_CPU_ARM64)
+#if defined(OS_WIN) || defined(OS_LINUX) || \
+    (defined(OS_ANDROID) && defined(ARCH_CPU_64_BITS))
 template <>
 struct ParamTraits<long> {
   typedef long param_type;