Don't activate app unconditionally on window "Show".

Should fix nwjs#1032.

Author: fancycode

src/browser/native_window_mac.mm

@@ -478,7 +478,7 @@ - (void)drawRect:(NSRect)dirtyRect {
 
 void NativeWindowCocoa::Show() {
   NSApplication *myApp = [NSApplication sharedApplication];
-  [myApp activateIgnoringOtherApps:YES];
+  [myApp activateIgnoringOtherApps:NO];
   content::RenderWidgetHostView* rwhv =
       shell_->web_contents()->GetRenderWidgetHostView();