[bindings] Introduce ScriptValue.to<T> to convert to native values.

Source/bindings/modules/v8/V8BindingForModules.cpp

Index: Source/bindings/modules/v8/V8BindingForModules.cpp
diff --git a/Source/bindings/modules/v8/V8BindingForModules.cpp b/Source/bindings/modules/v8/V8BindingForModules.cpp
index 8ed2e087afe6efc8d54a7e8efd68bd3327f31aff..6c9f34e0513233dd0555e4eab32346dfa9577cb7 100644
--- a/Source/bindings/modules/v8/V8BindingForModules.cpp
+++ b/Source/bindings/modules/v8/V8BindingForModules.cpp
@@ -399,21 +399,6 @@ bool canInjectIDBKeyIntoScriptValue(v8::Isolate* isolate, const ScriptValue& scr
     return canInjectNthValueOnKeyPath(isolate, v8Value, keyPathElements, keyPathElements.size() - 1);
 }
 
-IDBKey* scriptValueToIDBKey(v8::Isolate* isolate, const ScriptValue& scriptValue)
-{
-    ASSERT(isolate->InContext());
-    v8::HandleScope handleScope(isolate);
-    v8::Local<v8::Value> v8Value(scriptValue.v8Value());
-    return createIDBKeyFromValue(isolate, v8Value);
-}
-
-IDBKeyRange* scriptValueToIDBKeyRange(v8::Isolate* isolate, const ScriptValue& scriptValue)
-{
-    v8::HandleScope handleScope(isolate);
-    v8::Local<v8::Value> value(scriptValue.v8Value());
-    return V8IDBKeyRange::toImplWithTypeCheck(isolate, value);
-}
-
 ScriptValue deserializeScriptValue(ScriptState* scriptState, SerializedScriptValue* serializedValue, const Vector<blink::WebBlobInfo>* blobInfo)
 {
     v8::Isolate* isolate = scriptState->isolate();