Make Page Visibility API work when the browser window is visible or not

content/public/browser/render_widget_host_view.h

Index: content/public/browser/render_widget_host_view.h
diff --git a/content/public/browser/render_widget_host_view.h b/content/public/browser/render_widget_host_view.h
index d503fa9db67e32353e9932062ca3125609789823..586315a83275c886ef07f35d333f840117b14392 100644
--- a/content/public/browser/render_widget_host_view.h
+++ b/content/public/browser/render_widget_host_view.h
@@ -146,17 +146,14 @@ class CONTENT_EXPORT RenderWidgetHostView {
   // deleted after this call.
   virtual void EndFrameSubscription() = 0;
 
+  // Notifies the view that its enclosing window has changed visibility
+  // (minimized/unminimized, app hidden/unhidden, etc).
+  virtual void SetWindowVisibility(bool visible) = 0;
+
 #if defined(OS_MACOSX)
   // Set the view's active state (i.e., tint state of controls).
   virtual void SetActive(bool active) = 0;
 
-  // Notifies the view that its enclosing window has changed visibility
-  // (minimized/unminimized, app hidden/unhidden, etc).
-  // TODO(stuartmorgan): This is a temporary plugin-specific workaround for
-  // <http://crbug.com/34266>. Once that is fixed, this (and the corresponding
-  // message and renderer-side handling) can be removed in favor of using
-  // WasHidden/WasShown.
-  virtual void SetWindowVisibility(bool visible) = 0;
 
   // Informs the view that its containing window's frame changed.
   virtual void WindowFrameChanged() = 0;