Untangle bad depdenency from fxjse/ to fpdfsdk/

fxjse/fxjs_perisolatedata.cpp

+// Copyright 2016 PDFium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
+
+#include "fxjse/include/fxjs_perisolatedata.h"
+
+static unsigned int g_embedderDataSlot = 1u;
+
+// static
+void FXJS_PerIsolateData::SetEmbedderDataSlot(unsigned int slot) {
+  g_embedderDataSlot = slot;
+}
+
+// static
+unsigned int FXJS_PerIsolateData::EmbedderDataSlot() {
+  return g_embedderDataSlot;
+}
+
+// static
+void FXJS_PerIsolateData::SetUp(v8::Isolate* pIsolate) {
+  if (!pIsolate->GetData(g_embedderDataSlot))
+    pIsolate->SetData(g_embedderDataSlot, new FXJS_PerIsolateData());
+}
+
+// static
+FXJS_PerIsolateData* FXJS_PerIsolateData::Get(v8::Isolate* pIsolate) {
+  return static_cast<FXJS_PerIsolateData*>(
+      pIsolate->GetData(g_embedderDataSlot));
+}