Update Invalidate to take a rect

This Cl updates the various Invalidate methods to take a rect when possible.

Change-Id: I5359f4d8118f822347414ccb8d261aeef2ac35e0
Reviewed-on: https://pdfium-review.googlesource.com/2814
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/fpdfsdk/cfx_systemhandler.cpp b/fpdfsdk/cfx_systemhandler.cpp
index 8ccbd75..14d7729 100644
--- a/fpdfsdk/cfx_systemhandler.cpp
+++ b/fpdfsdk/cfx_systemhandler.cpp
@@ -53,9 +53,7 @@
 
   CFX_FloatRect rcPDF(left_top.x, right_bottom.y, right_bottom.x, left_top.y);
   rcPDF.Normalize();
-
-  m_pFormFillEnv->Invalidate(pPage, rcPDF.left, rcPDF.top, rcPDF.right,
-                             rcPDF.bottom);
+  m_pFormFillEnv->Invalidate(pPage, rcPDF.ToFxRect());
 }
 
 void CFX_SystemHandler::OutputSelectedRect(CFFL_FormFiller* pFormFiller,