Update from https://crrev.com/305340

third_party/checkstyle/README.chromium

Index: third_party/checkstyle/README.chromium
diff --git a/third_party/checkstyle/README.chromium b/third_party/checkstyle/README.chromium
index 53a267c45b31b3e77fa26e1e8fbf66eca9920619..0ceef781a44597321366a683e1c42dc1c80ef870 100644
--- a/third_party/checkstyle/README.chromium
+++ b/third_party/checkstyle/README.chromium
@@ -2,7 +2,7 @@ Name: Checkstyle is a development tool to help programmers write Java code that
       adheres to a coding standard.
 Short Name: checkstyle
 URL: http://checkstyle.sourceforge.net/
-Version: 5.9
+Version: 6.1
 License: LGPL 2.1
 License File: LICENSE
 Security Critical: no
@@ -11,16 +11,5 @@ Description:
 Checkstyle is used to validate Java code style on Chromium PRESUBMIT step.
 
 Local Modifications:
-- Removed contrib/ and site/ directories that contained examples of how to write
-  new checkstyle modules.
-- Removed xml files used for Eclipse setup when building new checkstyle modules.
-  - checkstyle_checks.xml
-  - import-control.xml
-  - supressions.xml
-- Removed jars already included in checkstyle-5.9-all.jar
-  - antlr-2.7.7.jar
-  - checkstyle-5.9.jar
-  - commons-beanutils-core-1.8.3.jar
-  - commons-cli-1.2.jar
-  - commons-logging-1.1.1.jar
-  - guava-jdk5-14.0.1.jar
+- Downloaded checkstyle-6.1-all.jar without source code development
+  documentation.