bindings: Use Maybe APIs in toXXX() functions

Source/bindings/core/v8/ExceptionState.h

Index: Source/bindings/core/v8/ExceptionState.h
diff --git a/Source/bindings/core/v8/ExceptionState.h b/Source/bindings/core/v8/ExceptionState.h
index 3acd126e8b3af60582f566143500b7c7a8bcb119..32bb4a2b58e40340ff47fc00cd7a0e9f0d13b8c0 100644
--- a/Source/bindings/core/v8/ExceptionState.h
+++ b/Source/bindings/core/v8/ExceptionState.h
@@ -103,6 +103,12 @@ public:
     const char* propertyName() const { return m_propertyName; }
     const char* interfaceName() const { return m_interfaceName; }
 
+    v8::Isolate* isolate() const
+    {
+        ASSERT(m_isolate);
+        return m_isolate;
+    }
+
     void rethrowV8Exception(v8::Handle<v8::Value> value)
     {
         setException(value);