MacViews: Don't switch Spaces when calling ShowInactive() for a child Widget.

ui/views/cocoa/bridged_native_widget.mm

Index: ui/views/cocoa/bridged_native_widget.mm
diff --git a/ui/views/cocoa/bridged_native_widget.mm b/ui/views/cocoa/bridged_native_widget.mm
index 2432960be0754f1890f7bcb7002f2ee249b2b741..9907347c10abe27ff54d04e41ec00f428e41d92a 100644
--- a/ui/views/cocoa/bridged_native_widget.mm
+++ b/ui/views/cocoa/bridged_native_widget.mm
@@ -428,6 +428,11 @@ void BridgedNativeWidget::Init(base::scoped_nsobject<NSWindow> window,
     } else {
       parent_ = new WidgetOwnerNSWindowAdapter(this, params.parent);
     }
+    // crbug.com/697829: Widget::ShowInactive() could result in a Space switch
+    // when the widget has a parent, and we're calling -orderWindow:relativeTo:.
+    // Use Transient collection behaviour to prevent that.
+    [window_ setCollectionBehavior:[window_ collectionBehavior] |
+                                   NSWindowCollectionBehaviorTransient];
   }
 
   // OSX likes to put shadows on most things. However, frameless windows (with