[bindings] Utilize ScriptValue::from and remove IDB* => ScriptValue conversion methods

Source/bindings/modules/v8/ToV8ForModules.h

 // Copyright (c) 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ToV8ForModules_h
 #define ToV8ForModules_h
 
 #include "bindings/core/v8/V8Binding.h"
 #include "modules/webdatabase/sqlite/SQLValue.h"
 
 namespace blink {
 
+class IDBAny;
+class IDBKey;
+class IDBKeyPath;
+
 inline v8::Handle<v8::Value> toV8(const SQLValue& sqlValue, v8::Handle<v8::Object> creationContext, v8::Isolate* isolate)
 {
     switch (sqlValue.type()) {
     case SQLValue::NullValue:
         return v8::Null(isolate);
     case SQLValue::NumberValue:
         return v8::Number::New(isolate, sqlValue.number());
     case SQLValue::StringValue:
         return v8String(isolate, sqlValue.string());
     }
     ASSERT_NOT_REACHED();
     return v8::Local<v8::Value>();
 }
 
+v8::Local<v8::Value> toV8(const IDBKeyPath&, v8::Local<v8::Object> creationContext, v8::Isolate*);
+v8::Local<v8::Value> toV8(const IDBKey*, v8::Local<v8::Object> creationContext, v8::Isolate*);
+v8::Local<v8::Value> toV8(const IDBAny*, v8::Local<v8::Object> creationContext, v8::Isolate*);
+
 } // namespace blink
 
 #endif // ToV8ForModules_h