Revert of Add build_config_functions.h to avoid #ifdef

sandbox/linux/tests/unit_tests.cc

Index: sandbox/linux/tests/unit_tests.cc
diff --git a/sandbox/linux/tests/unit_tests.cc b/sandbox/linux/tests/unit_tests.cc
index 01844d28641479a97e1606c58801b1534b659f09..ad30d840f43acf7c573442892692612b0cd0aabf 100644
--- a/sandbox/linux/tests/unit_tests.cc
+++ b/sandbox/linux/tests/unit_tests.cc
@@ -40,6 +40,22 @@
 }  // namespace
 
 namespace sandbox {
+
+bool IsAndroid() {
+#if defined(OS_ANDROID)
+  return true;
+#else
+  return false;
+#endif
+}
+
+bool IsArchitectureArm() {
+#if defined(ARCH_CPU_ARM_FAMILY)
+  return true;
+#else
+  return false;
+#endif
+}
 
 // TODO(jln): figure out why base/.../dynamic_annotations.h's
 // RunningOnValgrind() cannot link.