clean-up libutils includes

moved Foo.h as first include of Foo.cpp, and
removed redundant includes.

Made NativeHandle non virtual.


Test: run & compile
Bug: n/a

Change-Id: I37fa746cd42c9ba23aba181f84cb6c619386406a
diff --git a/libutils/Trace.cpp b/libutils/Trace.cpp
index 36fd802..8530fdc 100644
--- a/libutils/Trace.cpp
+++ b/libutils/Trace.cpp
@@ -14,12 +14,11 @@
  * limitations under the License.
  */
 
-#include <utils/misc.h>
 #include <utils/Trace.h>
+#include <utils/misc.h>
 
 static void traceInit() __attribute__((constructor));
 
-static void traceInit()
-{
+static void traceInit() {
     ::android::add_sysprop_change_callback(atrace_update_tags, 0);
 }