Move CPDFSDK_Environment code to cpp file

This CL moves the code from the .h file into the .cpp file.

Review-Url: https://codereview.chromium.org/2354363003
diff --git a/xfa/fxfa/app/xfa_fftext.cpp b/xfa/fxfa/app/xfa_fftext.cpp
index 2e5bb64..ad0fdbc 100644
--- a/xfa/fxfa/app/xfa_fftext.cpp
+++ b/xfa/fxfa/app/xfa_fftext.cpp
@@ -135,7 +135,7 @@
     return FALSE;
   }
   CXFA_FFDoc* pDoc = GetDoc();
-  pDoc->GetDocEnvironment()->GotoURL(pDoc, wsURLContent, FALSE);
+  pDoc->GetDocEnvironment()->GotoURL(pDoc, wsURLContent);
   return TRUE;
 }
 FWL_WidgetHit CXFA_FFText::OnHitTest(FX_FLOAT fx, FX_FLOAT fy) {