Add some preprocessor directives to allow compiling without V8.

fpdfsdk/src/fsdk_mgr.cpp

 // Copyright 2014 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 "../../public/fpdf_ext.h"
 #include "../../third_party/base/nonstd_unique_ptr.h"
 #include "../include/fsdk_define.h"
 #include "../include/fsdk_mgr.h"
@@ skipping 352 matching lines @@
                                      bUI, pTo, pSubject, pCC, pBcc, pMsg);
     bsTo.ReleaseBuffer();
     bsCC.ReleaseBuffer();
     bsBcc.ReleaseBuffer();
     bsSubject.ReleaseBuffer();
     bsMsg.ReleaseBuffer();
   }
 }
 
 IJS_Runtime* CPDFDoc_Environment::GetJSRuntime() {
+#ifdef DISABLE_V8
+  return NULL;
+#else
   if (!IsJSInitiated())
     return NULL;
   if (!m_pJSRuntime)
     m_pJSRuntime.reset(IJS_Runtime::Create(this));
   return m_pJSRuntime.get();
+#endif  // DISABLE_V8
 }
 
 CPDFSDK_AnnotHandlerMgr* CPDFDoc_Environment::GetAnnotHandlerMgr() {
   if (!m_pAnnotHandlerMgr)
     m_pAnnotHandlerMgr = new CPDFSDK_AnnotHandlerMgr(this);
   return m_pAnnotHandlerMgr;
 }
 
 CPDFSDK_ActionHandler* CPDFDoc_Environment::GetActionHander() {
   if (!m_pActionHandler)
@@ skipping 599 matching lines @@
   if (!pFocusAnnot)
     return NULL;
 
   for (int i = 0; i < m_fxAnnotArray.GetSize(); i++) {
     CPDFSDK_Annot* pAnnot = (CPDFSDK_Annot*)m_fxAnnotArray.GetAt(i);
     if (pAnnot == pFocusAnnot)
       return pAnnot;
   }
   return NULL;
 }