Remove auto raw pointer deduction from non-linux specific code.

mojo/android/system/watcher_impl.cc

Index: mojo/android/system/watcher_impl.cc
diff --git a/mojo/android/system/watcher_impl.cc b/mojo/android/system/watcher_impl.cc
index 756ffe3f3bcaf317cf0b72f7b8c9dc9c6366a7ec..28d8c9f1e7a04bddf0c7758da1c2f6b7d9089c39 100644
--- a/mojo/android/system/watcher_impl.cc
+++ b/mojo/android/system/watcher_impl.cc
@@ -85,7 +85,7 @@ static jint Start(JNIEnv* env,
                   jlong watcher_ptr,
                   jint mojo_handle,
                   jint signals) {
-  auto watcher = reinterpret_cast<WatcherImpl*>(watcher_ptr);
+  auto* watcher = reinterpret_cast<WatcherImpl*>(watcher_ptr);
   return watcher->Start(env, jcaller, mojo_handle, signals);
 }