remove encode lib, clean all encoded area.

app/models/commit.rb

@@ -1,6 +1,5 @@
 class Commit
   include ActiveModel::Conversion
-  include Gitlab::Encode
   include StaticModel
   extend ActiveModel::Naming
 
@@ -112,7 +111,7 @@ class Commit
   end
 
   def safe_message
-    @safe_message ||= utf8 message
+    @safe_message ||= message
   end
 
   def created_at
@@ -124,7 +123,7 @@ class Commit
   end
 
   def author_name
-    utf8 author.name
+    author.name
   end
 
   # Was this commit committed by a different person than the original author?
@@ -133,7 +132,7 @@ class Commit
   end
 
   def committer_name
-    utf8 committer.name
+    committer.name
   end
 
   def committer_email

app/models/tree.rb

@@ -8,7 +8,7 @@ class Tree
   def initialize(raw_tree, project, ref = nil, path = nil)
     @project, @ref, @path = project, ref, path
     @tree = if path.present?
-              raw_tree / path.dup.force_encoding('ascii-8bit')
+              raw_tree / path
             else
               raw_tree
             end