Update the pdfium library

Note: pdfium does not have releases, rather the repository is
      kept up-to-date. This was pulled on: 6/4/2015.

Change-Id: I3c6d77fa1f7c6da2b7df3c4e5c00093900125bc2
diff --git a/core/src/fxge/agg/agg23/agg_vcgen_stroke.h b/core/src/fxge/agg/agg23/agg_vcgen_stroke.h
index 38fe1fc..84fadd6 100644
--- a/core/src/fxge/agg/agg23/agg_vcgen_stroke.h
+++ b/core/src/fxge/agg/agg23/agg_vcgen_stroke.h
@@ -18,7 +18,7 @@
 #include "agg_math_stroke.h"
 namespace agg
 {
-class vcgen_stroke : public CFX_Object
+class vcgen_stroke 
 {
     enum status_e {
         initial,