Move CSS flex-direction property from Flex to Position and delete Flex

components/layout/flex.rs

@@ -25,7 +25,6 @@ use std::cmp::max;
 use std::sync::Arc;
 use style::computed_values::flex_direction;
 use style::logical_geometry::LogicalSize;
-use style::properties::style_structs;
 use style::properties::{ComputedValues, ServoComputedValues};
 use style::values::computed::{LengthOrPercentage, LengthOrPercentageOrAuto, LengthOrPercentageOrNone};
 
@@ -88,10 +87,6 @@ pub struct FlexFlow {
     available_cross_size: AxisSize
 }
 
-fn flex_style(fragment: &Fragment) -> &style_structs::Flex {
-    fragment.style.get_flex()
-}
-
 // TODO(zentner): This function should use flex-basis.
 fn flex_item_inline_sizes(flow: &mut Flow) -> IntrinsicISizes {
     let _scope = layout_debug_scope!("flex::flex_item_inline_sizes");
@@ -113,7 +108,7 @@ impl FlexFlow {
                          flotation: Option<FloatKind>)
                          -> FlexFlow {
 
-        let main_mode = match flex_style(&fragment).flex_direction {
+        let main_mode = match fragment.style.get_position().flex_direction {
             flex_direction::T::row_reverse | flex_direction::T::row => Mode::Inline,
             flex_direction::T::column_reverse | flex_direction::T::column => Mode::Block
         };

components/layout/incremental.rs

@@ -208,7 +208,7 @@ pub fn compute_damage(old: Option<&Arc<ServoComputedValues>>, new: &ServoCompute
         get_inheritedtable.border_collapse,
         get_inheritedtable.border_spacing,
         get_column.column_gap,
-        get_flex.flex_direction
+        get_position.flex_direction
     ]) || add_if_not_equal!(old, new, damage,
                             [ REPAINT, STORE_OVERFLOW, REFLOW_OUT_OF_FLOW ], [
         get_position.top, get_position.left,

components/style/properties.mako.rs

@@ -4860,7 +4860,7 @@ pub mod longhands {
     // CSS Flexible Box Layout Module Level 1
     // http://www.w3.org/TR/css3-flexbox/
 
-    ${new_style_struct("Flex", is_inherited=False)}
+    ${switch_to_style_struct("Position")}
 
     // Flex container properties
     ${single_keyword("flex-direction", "row row-reverse column column-reverse", experimental=True)}