Bug 1047620 - Fix sandboxing for B2G --disable-jemalloc builds. r=kang

--HG--
extra : rebase_source : 1b2ec6491277a9dc451ab767d8563076cf522c27

security/sandbox/linux/SandboxFilter.cpp

@@ -191,6 +191,11 @@ SandboxFilterImplContent::Build() {
   Allow(SYSCALL(fsync));
   Allow(SYSCALL(msync));
 
+#if defined(ANDROID) && !defined(MOZ_MEMORY)
+  // Android's libc's realloc uses mremap.
+  Allow(SYSCALL(mremap));
+#endif
+
   /* Should remove all of the following in the future, if possible */
   Allow(SYSCALL(getpriority));
   Allow(SYSCALL(sched_get_priority_min));