Replace all uses of the style::stylearc alias with servo_arc.

The alias is left there temporarilly and will be removed completely in a later commit where
also components/style/gecko/generated/structs_{debug|release}.rs are re-generated (they still
use the old alias).

components/gfx/font_context.rs

@@ -11,6 +11,7 @@ use heapsize::HeapSizeOf;
 use platform::font::FontHandle;
 use platform::font_context::FontContextHandle;
 use platform::font_template::FontTemplateData;
+use servo_arc::Arc as ServoArc;
 use smallvec::SmallVec;
 use std::cell::RefCell;
 use std::collections::HashMap;
@@ -21,7 +22,6 @@ use std::sync::Arc;
 use std::sync::atomic::{AtomicUsize, Ordering, ATOMIC_USIZE_INIT};
 use style::computed_values::{font_style, font_variant_caps};
 use style::properties::style_structs;
-use style::stylearc::Arc as StyleArc;
 use webrender_api;
 
 static SMALL_CAPS_SCALE_FACTOR: f32 = 0.8;      // Matches FireFox (see gfxFont.h)
@@ -110,7 +110,7 @@ impl FontContext {
     /// Create a group of fonts for use in layout calculations. May return
     /// a cached font if this font instance has already been used by
     /// this context.
-    pub fn layout_font_group_for_style(&mut self, style: StyleArc<style_structs::Font>)
+    pub fn layout_font_group_for_style(&mut self, style: ServoArc<style_structs::Font>)
                                        -> Rc<FontGroup> {
         self.expire_font_caches_if_necessary();
 
@@ -240,7 +240,7 @@ impl HeapSizeOf for FontContext {
 
 #[derive(Debug)]
 struct LayoutFontGroupCacheKey {
-    pointer: StyleArc<style_structs::Font>,
+    pointer: ServoArc<style_structs::Font>,
     size: Au,
 }