Polish a little bit the code

Author: abelgardep

owncloudComLibrary/src/main/java/com/owncloud/android/lib/common/http/HttpConstants.java

@@ -55,7 +55,6 @@ public class HttpConstants {
     public static final String HEADER_AUTHORIZATION_CODE = "code";
     public static final String HEADER_GRANT_TYPE = "grant_type";
     public static final String HEADER_REDIRECT_URI = "redirect_uri";
-    public static final String HEADER_CODE_VERIFIER = "code_verifier";
     public static final String HEADER_REFRESH_TOKEN = "refresh_token";
 
     /***********************************************************************************************************

owncloudComLibrary/src/main/java/com/owncloud/android/lib/resources/oauth/TokenRequestRemoteOperation.kt

@@ -28,11 +28,6 @@ package com.owncloud.android.lib.resources.oauth
 
 import com.owncloud.android.lib.common.OwnCloudClient
 import com.owncloud.android.lib.common.http.HttpConstants.AUTHORIZATION_HEADER
-import com.owncloud.android.lib.common.http.HttpConstants.HEADER_AUTHORIZATION_CODE
-import com.owncloud.android.lib.common.http.HttpConstants.HEADER_CODE_VERIFIER
-import com.owncloud.android.lib.common.http.HttpConstants.HEADER_GRANT_TYPE
-import com.owncloud.android.lib.common.http.HttpConstants.HEADER_REDIRECT_URI
-import com.owncloud.android.lib.common.http.HttpConstants.HEADER_REFRESH_TOKEN
 import com.owncloud.android.lib.common.http.HttpConstants.HTTP_OK
 import com.owncloud.android.lib.common.http.methods.nonwebdav.PostMethod
 import com.owncloud.android.lib.common.operations.RemoteOperation
@@ -41,8 +36,6 @@ import com.owncloud.android.lib.resources.oauth.params.TokenRequestParams
 import com.owncloud.android.lib.resources.oauth.responses.TokenResponse
 import com.squareup.moshi.JsonAdapter
 import com.squareup.moshi.Moshi
-import okhttp3.FormBody
-import okio.ByteString.Companion.encodeUtf8
 import timber.log.Timber
 import java.net.URL
 

owncloudComLibrary/src/main/java/com/owncloud/android/lib/resources/oauth/params/TokenRequestParams.kt

@@ -39,16 +39,14 @@ sealed class TokenRequestParams(
         clientAuth: String,
         grantType: String,
         val authorizationCode: String,
-        val redirectUri: String,
-        val codeVerifier: String
+        val redirectUri: String
     ) : TokenRequestParams(tokenEndpoint, clientAuth, grantType) {
 
         override fun toRequestBody(): RequestBody {
             return FormBody.Builder()
                 .add(HttpConstants.HEADER_AUTHORIZATION_CODE, authorizationCode)
                 .add(HttpConstants.HEADER_GRANT_TYPE, grantType)
                 .add(HttpConstants.HEADER_REDIRECT_URI, redirectUri)
-                .add(HttpConstants.HEADER_CODE_VERIFIER, codeVerifier)
                 .build()
         }
     }