Merge to XFA: Move a unique_ptr initialisation out of the initialisation list in fsdk_mgr.cpp

TBR=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1407103006 .

(cherry picked from commit ef26566853fcd014f4b5c4944e480db75afc6729)

Review URL: https://codereview.chromium.org/1412793013 .
diff --git a/fpdfsdk/src/fsdk_mgr.cpp b/fpdfsdk/src/fsdk_mgr.cpp
index d7c0e14..9bb603d 100644
--- a/fpdfsdk/src/fsdk_mgr.cpp
+++ b/fpdfsdk/src/fsdk_mgr.cpp
@@ -211,10 +211,8 @@
 
 CPDFDoc_Environment::CPDFDoc_Environment(CPDFXFA_Document* pDoc,
                                          FPDF_FORMFILLINFO* pFFinfo)
-    : m_pInfo(pFFinfo),
-      m_pSDKDoc(NULL),
-      m_pXFADoc(pDoc),
-      m_pSysHandler(new CFX_SystemHandler(this)) {
+    : m_pInfo(pFFinfo), m_pSDKDoc(NULL), m_pXFADoc(pDoc) {
+  m_pSysHandler.reset(new CFX_SystemHandler(this));
 }
 
 CPDFDoc_Environment::~CPDFDoc_Environment() {