Update from https://crrev.com/316786

sandbox/linux/system_headers/android_arm_ucontext.h

Index: sandbox/linux/system_headers/android_arm_ucontext.h
diff --git a/sandbox/linux/services/android_arm_ucontext.h b/sandbox/linux/system_headers/android_arm_ucontext.h
similarity index 83%
rename from sandbox/linux/services/android_arm_ucontext.h
rename to sandbox/linux/system_headers/android_arm_ucontext.h
index d1446c67bd75238f7ef5c16fedb9e657659977e3..a3804997e50205a542c48ffbfbe1c93da9253d5a 100644
--- a/sandbox/linux/services/android_arm_ucontext.h
+++ b/sandbox/linux/system_headers/android_arm_ucontext.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_
-#define SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_
+#ifndef SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_ARM_UCONTEXT_H_
+#define SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_ARM_UCONTEXT_H_
 
 #if !defined(__BIONIC_HAVE_UCONTEXT_T)
 #include <asm/sigcontext.h>
@@ -29,4 +29,4 @@ typedef struct ucontext {
 #include <sys/ucontext.h>
 #endif  // __BIONIC_HAVE_UCONTEXT_T
 
-#endif  // SANDBOX_LINUX_SERVICES_ANDROID_ARM_UCONTEXT_H_
+#endif  // SANDBOX_LINUX_SYSTEM_HEADERS_ANDROID_ARM_UCONTEXT_H_