Clean-up inline members of nested classes (ash/)

ash/wm/shelf_layout_manager.cc

Index: ash/wm/shelf_layout_manager.cc
diff --git a/ash/wm/shelf_layout_manager.cc b/ash/wm/shelf_layout_manager.cc
index 6c0d9e605f8c772efb5d9c594041909126ecfff5..fa758dc4a43a559c74469987457ff38142699dc1 100644
--- a/ash/wm/shelf_layout_manager.cc
+++ b/ash/wm/shelf_layout_manager.cc
@@ -328,6 +328,8 @@ void ShelfLayoutManager::OnWindowActivated(aura::Window* active,
 ////////////////////////////////////////////////////////////////////////////////
 // ShelfLayoutManager, private:
 
+ShelfLayoutManager::TargetBounds::TargetBounds() : opacity(0.0f) {}
+
 gfx::Rect ShelfLayoutManager::GetMaximizedWindowBounds(
     aura::Window* window) {
   gfx::Rect bounds(ScreenAsh::GetDisplayBoundsInParent(window));