Release Edge callbacks after registering #2339

This commit releases the HandleCoreWebView2SwtCallback resource created by Edge browser in
createControllerInitializationCallback after it has been registered by
CreateCoreWebView2Controller method as otherwise the
HandleCoreWebView2SwtCallback object can cause memory leaks if left
unreleased.

fixes #2339

Author: amartya4256

bundles/org.eclipse.swt/Eclipse SWT Browser/win32/org/eclipse/swt/browser/Edge.java

@@ -662,7 +662,9 @@ private void createInstance(int previousAttempts) {
 	int hr = containingEnvironment.environment().QueryInterface(COM.IID_ICoreWebView2Environment2, ppv);
 	if (hr == COM.S_OK) environment2 = new ICoreWebView2Environment2(ppv[0]);
 	// The webview calls are queued to be executed when it is done executing the current task.
-	containingEnvironment.environment().CreateCoreWebView2Controller(browser.handle, createControllerInitializationCallback(previousAttempts));
+	IUnknown controllerInitializationHandler = createControllerInitializationCallback(previousAttempts);
+	containingEnvironment.environment().CreateCoreWebView2Controller(browser.handle, controllerInitializationHandler);
+	controllerInitializationHandler.Release();
 }
 
 private IUnknown createControllerInitializationCallback(int previousAttempts) {