Cleanup env variable names

This CL cleans up any old m_pEnv variables to
be correctly named m_pFormFillEnv.

Review-Url: https://codereview.chromium.org/2412523002
diff --git a/fpdfsdk/javascript/PublicMethods.cpp b/fpdfsdk/javascript/PublicMethods.cpp
index 344af5a..2310200 100644
--- a/fpdfsdk/javascript/PublicMethods.cpp
+++ b/fpdfsdk/javascript/PublicMethods.cpp
@@ -79,9 +79,9 @@
 }
 
 void AlertIfPossible(CJS_Context* pContext, const FX_WCHAR* swMsg) {
-  CPDFSDK_FormFillEnvironment* pEnv = pContext->GetFormFillEnv();
-  if (pEnv)
-    pEnv->JS_appAlert(swMsg, nullptr, 0, 3);
+  CPDFSDK_FormFillEnvironment* pFormFillEnv = pContext->GetFormFillEnv();
+  if (pFormFillEnv)
+    pFormFillEnv->JS_appAlert(swMsg, nullptr, 0, 3);
 }
 
 }  // namespace