lint: remove unused consts/fields

The constants in particular could have been used,
but do not seem that they'd improve readability:
these aren't "magic" byte literals,
because they're well and widely understood aspects of the JSON syntax.

Author: extemporalgenome

json/codec.go

@@ -995,7 +995,6 @@ type structType struct {
 	ficaseIndex map[string]*structField
 	keyset      []byte
 	typ         reflect.Type
-	inlined     bool
 }
 
 type structField struct {

json/parse.go

@@ -21,11 +21,6 @@ const (
 	cr = '\r'
 )
 
-const (
-	escape = '\\'
-	quote  = '"'
-)
-
 func internalParseFlags(b []byte) (flags ParseFlags) {
 	// Don't consider surrounding whitespace
 	b = skipSpaces(b)