Migrate ItemType::from_type_kind to convert::From.

Author: frewsxcv

src/librustdoc/html/item_type.rs

@@ -85,8 +85,8 @@ impl<'a> From<&'a clean::Item> for ItemType {
     }
 }
 
-impl ItemType {
-    pub fn from_type_kind(kind: clean::TypeKind) -> ItemType {
+impl From<clean::TypeKind> for ItemType {
+    fn from(kind: clean::TypeKind) -> ItemType {
         match kind {
             clean::TypeStruct   => ItemType::Struct,
             clean::TypeEnum     => ItemType::Enum,
@@ -99,7 +99,9 @@ impl ItemType {
             clean::TypeTypedef  => ItemType::Typedef,
         }
     }
+}
 
+impl ItemType {
     pub fn css_class(&self) -> &'static str {
         match *self {
             ItemType::Module          => "mod",

src/librustdoc/html/render.rs

@@ -509,7 +509,7 @@ pub fn run(mut krate: clean::Crate,
     } = renderinfo;
 
     let external_paths = external_paths.into_iter()
-        .map(|(k, (v, t))| (k, (v, ItemType::from_type_kind(t))))
+        .map(|(k, (v, t))| (k, (v, ItemType::from(t))))
         .collect();
 
     let mut cache = Cache {