Add noexcept to move constructors and assignment operators.

Bug: 116614593
Test: build with WITH_TIDY=1
Change-Id: I8e8a665ed0f432e345ca928cbee5ec877adbcc8d
diff --git a/update_manager/boxed_value.h b/update_manager/boxed_value.h
index 5f41835..c6aaf4d 100644
--- a/update_manager/boxed_value.h
+++ b/update_manager/boxed_value.h
@@ -70,8 +70,9 @@
   // move constructor explicitly preventing it from accidental references,
   // like in:
   //   BoxedValue new_box(std::move(other_box));
-  BoxedValue(BoxedValue&& other)  // NOLINT(build/c++11)
-      : value_(other.value_), deleter_(other.deleter_),
+  BoxedValue(BoxedValue&& other) noexcept  // NOLINT(build/c++11)
+      : value_(other.value_),
+        deleter_(other.deleter_),
         printer_(other.printer_) {
     other.value_ = nullptr;
     other.deleter_ = nullptr;