Add status code "Bad Request" (400).

FanghuiQ · garrettjonesgoogle · commit 956df84159e4 · 2017-06-30T15:00:24.000-07:00
------------- Created by MOE: https://github.com/google/moe MOE_MIGRATED_REVID=141460113
diff --git a/google-http-client/src/main/java/com/google/api/client/http/HttpStatusCodes.java b/google-http-client/src/main/java/com/google/api/client/http/HttpStatusCodes.java
@@ -51,6 +51,9 @@ public class HttpStatusCodes {
   /** Status code for a resource that has temporarily moved to a new URI. */
   public static final int STATUS_CODE_TEMPORARY_REDIRECT = 307;
 
+  /** Status code for a request that could not be understood by the server. */
+  public static final int STATUS_CODE_BAD_REQUEST = 400;
+
   /** Status code for a request that requires user authentication. */
   public static final int STATUS_CODE_UNAUTHORIZED = 401;
 
