Merge pull request #48698 from sakeven/remove_mime

Automatic merge from submit-queue

remove svg mime type extension

Signed-off-by: sakeven <jc5930@sina.cn>



**What this PR does / why we need it**:

I found that [kubernetes requires go version 1.6 or greater](https://github.com/kubernetes/kubernetes/blob/master/hack/lib/golang.sh#L335).
While the [commit](21e47d831b)  which adds "image/svg+xml" type for extension ".svg", has been merged to go from version 1.5 to 1.9beta.

So it's safe to remove code ```mime.AddExtensionType(".svg", "image/svg+xml")```.

**Special notes for your reviewer**:

**Release note**:

```
NONE
```

staging/src/k8s.io/apiserver/pkg/server/genericapiserver.go

@@ -18,7 +18,6 @@ package server
 
 import (
 	"fmt"
-	"mime"
 	"net/http"
 	"strings"
 	"sync"
@@ -223,13 +222,6 @@ func (s emptyDelegate) OpenAPISpec() *spec.Swagger {
 	return nil
 }
 
-func init() {
-	// Send correct mime type for .svg files.
-	// TODO: remove when https://github.com/golang/go/commit/21e47d831bafb59f22b1ea8098f709677ec8ce33
-	// makes it into all of our supported go versions (only in v1.7.1 now).
-	mime.AddExtensionType(".svg", "image/svg+xml")
-}
-
 // RequestContextMapper is exposed so that third party resource storage can be build in a different location.
 // TODO refactor third party resource storage
 func (s *GenericAPIServer) RequestContextMapper() apirequest.RequestContextMapper {