Fix XFA specific use of m_sTimeMap. This fixes a build break.

R=bo_xu@foxitsoftware.com

Review URL: https://codereview.chromium.org/823653004
diff --git a/fpdfsdk/include/javascript/JS_Object.h b/fpdfsdk/include/javascript/JS_Object.h
index 7bdfcf1..7ee3464 100644
--- a/fpdfsdk/include/javascript/JS_Object.h
+++ b/fpdfsdk/include/javascript/JS_Object.h
@@ -198,7 +198,7 @@
 		if (m_nTimerID)
 		{
 			if (m_pApp == NULL) {
-				m_sTimeMap.RemoveAt(m_nTimerID);
+				GetTimeMap().RemoveAt(m_nTimerID);
 				m_nTimerID = 0;
 				return;
 			}