Move WebMIMERegistry impl from //content to blink:platform/network/mime

content/ppapi_plugin/ppapi_blink_platform_impl.cc

Index: content/ppapi_plugin/ppapi_blink_platform_impl.cc
diff --git a/content/ppapi_plugin/ppapi_blink_platform_impl.cc b/content/ppapi_plugin/ppapi_blink_platform_impl.cc
index 71adea6d1aea80f66be65ed129587b0cbcb846b6..c4dc0cf31591afc3da74955c3c68bc4df7e2ad91 100644
--- a/content/ppapi_plugin/ppapi_blink_platform_impl.cc
+++ b/content/ppapi_plugin/ppapi_blink_platform_impl.cc
@@ -143,11 +143,6 @@ blink::WebClipboard* PpapiBlinkPlatformImpl::clipboard() {
   return NULL;
 }
 
-blink::WebMimeRegistry* PpapiBlinkPlatformImpl::mimeRegistry() {
-  NOTREACHED();
-  return NULL;
-}
-
 blink::WebFileUtilities* PpapiBlinkPlatformImpl::fileUtilities() {
   NOTREACHED();
   return NULL;