Fix Windows shared library build.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index b3dff3fee107a6e3992e925b488d8ba760723e50..37bd427df205ee77771445f5448c85612b8692f5 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -2735,7 +2735,7 @@ class V8EXPORT Template : public Data {
 
 
 template<typename T>
-class V8EXPORT ReturnValue {
+class ReturnValue {
  public:
   V8_INLINE(explicit ReturnValue(internal::Object** slot));
   // Handle setters
@@ -2763,7 +2763,7 @@ class V8EXPORT ReturnValue {
  * the holder of the function.
  */
 template<typename T>
-class V8EXPORT FunctionCallbackInfo {
+class FunctionCallbackInfo {
  public:
   V8_INLINE(int Length() const);
   V8_INLINE(Local<Value> operator[](int i) const);
@@ -2811,7 +2811,7 @@ class V8EXPORT Arguments : public FunctionCallbackInfo<Value> {
  * of the property access.
  */
 template<typename T>
-class V8EXPORT PropertyCallbackInfo {
+class PropertyCallbackInfo {
  public:
   V8_INLINE(Isolate* GetIsolate() const);
   V8_INLINE(Local<Value> Data() const);