Clean up Fence a little.

Test: Cleanup patch only. Fences still work.

Change-Id: I65e5cdf5e3c067bc475c085ab6d3577d9753231c
diff --git a/include/ui/Fence.h b/include/ui/Fence.h
index 99b39d8..58df24c 100644
--- a/include/ui/Fence.h
+++ b/include/ui/Fence.h
@@ -18,21 +18,17 @@
 #define ANDROID_FENCE_H
 
 #include <stdint.h>
-#include <sys/types.h>
 
-#include <ui/ANativeObjectBase.h>
-#include <ui/PixelFormat.h>
-#include <ui/Rect.h>
 #include <utils/Flattenable.h>
-#include <utils/String8.h>
+#include <utils/RefBase.h>
 #include <utils/Timers.h>
 
 #include <experimental/optional>
 
-struct ANativeWindowBuffer;
-
 namespace android {
 
+class String8;
+
 // ===========================================================================
 // Fence
 // ===========================================================================
@@ -62,6 +58,12 @@
     // closed.
     explicit Fence(int fenceFd);
 
+    // Not copyable or movable.
+    Fence(const Fence& rhs) = delete;
+    Fence& operator=(const Fence& rhs) = delete;
+    Fence(Fence&& rhs) = delete;
+    Fence& operator=(Fence&& rhs) = delete;
+
     // Check whether the Fence has an open fence file descriptor. Most Fence
     // methods treat an invalid file descriptor just like a valid fence that
     // is already signalled, so using this is usually not necessary.
@@ -135,11 +137,6 @@
     friend class LightRefBase<Fence>;
     ~Fence();
 
-    // Disallow copying
-    Fence(const Fence& rhs);
-    Fence& operator = (const Fence& rhs);
-    const Fence& operator = (const Fence& rhs) const;
-
     int mFenceFd;
 };