Merge to XFA: Switch from nonstd::unique_ptr to std::unique_ptr.

fpdfsdk/src/javascript/JS_Runtime_Stub.cpp

Index: fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
diff --git a/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp b/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
index 1d94976edf82090e3cd686e2f336993ddaaf94e4..e9d5a221f7381e9617e04aaebc740c775a9d1042 100644
--- a/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
+++ b/fpdfsdk/src/javascript/JS_Runtime_Stub.cpp
@@ -4,9 +4,10 @@
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
+#include <memory>
+
 #include "fpdfsdk/include/fsdk_mgr.h"  // For CPDFDoc_Environment.
 #include "fpdfsdk/include/javascript/IJavaScript.h"
-#include "third_party/base/nonstd_unique_ptr.h"
 
 class CJS_ContextStub final : public IJS_Context {
  public:
@@ -156,7 +157,7 @@ class CJS_RuntimeStub final : public IJS_Runtime {
 
  protected:
   CPDFSDK_Document* m_pDoc;
-  nonstd::unique_ptr<CJS_ContextStub> m_pContext;
+  std::unique_ptr<CJS_ContextStub> m_pContext;
 };
 
 // static