Move xfa/fxfa/include to xfa/fxfa

BUG=pdfium:611

Review-Url: https://codereview.chromium.org/2383593002
diff --git a/fpdfsdk/DEPS b/fpdfsdk/DEPS
index 840666d..89f247e 100644
--- a/fpdfsdk/DEPS
+++ b/fpdfsdk/DEPS
@@ -12,6 +12,6 @@
   '+public',
   '+v8',
   '+xfa/fwl/core',
-  '+xfa/fxfa/include',
+  '+xfa/fxfa',
   '+xfa/fxgraphics',
 ]