Bug 1423461 - Use noexcept in mozalloc.h on android. r=njn

Bug 1163171 removed support for building for android with GCC, and we
don't need to use throw() anymore. We can use the same code as for other
non-Windows platforms.

--HG--
extra : rebase_source : 9c2c2179a6d214096619ff0ae1d1a42912beda79

memory/mozalloc/mozalloc.h

@@ -125,16 +125,7 @@ MOZ_END_EXTERN_C
 #  define MOZALLOC_EXPORT_NEW
 #endif
 
-#if defined(ANDROID)
-/*
- * It's important to always specify 'throw()' in GCC because it's used to tell
- * GCC that 'new' may return null. That makes GCC null-check the result before
- * potentially initializing the memory to zero.
- * Also, the Android minimalistic headers don't include std::bad_alloc.
- */
-#define MOZALLOC_THROW_IF_HAS_EXCEPTIONS throw()
-#define MOZALLOC_THROW_BAD_ALLOC_IF_HAS_EXCEPTIONS
-#elif defined(_MSC_VER)
+#if defined(_MSC_VER)
 /*
  * Suppress build warning spam (bug 578546).
  */