Clean up include paths

Remove runtime/globals.h and make clients point to the right globals.h
(libartbase/base/globals.h).  Also make within-libartbase includes
relative rather than using base/, etc.

Bug: 22322814
Test: make -j 40 checkbuild
Change-Id: I99de63fc851d48946ab401e2369de944419041c7
diff --git a/runtime/gc/reference_processor.h b/runtime/gc/reference_processor.h
index 1d984eb..c6c7836 100644
--- a/runtime/gc/reference_processor.h
+++ b/runtime/gc/reference_processor.h
@@ -17,8 +17,8 @@
 #ifndef ART_RUNTIME_GC_REFERENCE_PROCESSOR_H_
 #define ART_RUNTIME_GC_REFERENCE_PROCESSOR_H_
 
+#include "base/globals.h"
 #include "base/mutex.h"
-#include "globals.h"
 #include "jni.h"
 #include "reference_queue.h"