Android: Update errorprone to 2.3.1

https://github.com/google/error-prone/releases/tag/v2.3.1

Bug: 834756
Change-Id: I658f503b854ea02fb70f63e3ee110502e6f4d7dd
Reviewed-on: https://chromium-review.googlesource.com/1024915Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Peter Wen <wnwen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553621}

DEPS

@@ -528,7 +528,7 @@ deps = {
   },
 
   'src/third_party/errorprone/lib': {
-      'url': Var('chromium_git') + '/chromium/third_party/errorprone.git' + '@' + 'e352be7c87f3f9fc06bdfffe8a5e0801a6951ec1',
+      'url': Var('chromium_git') + '/chromium/third_party/errorprone.git' + '@' + '980d49e839aa4984015efed34b0134d4b2c9b6d7',
       'condition': 'checkout_android',
   },
 

third_party/errorprone/BUILD.gn

@@ -5,7 +5,7 @@
 import("//build/config/android/rules.gni")
 
 if (current_toolchain == default_toolchain) {
-  version = "2.3.0"
+  version = "2.3.1"
   java_library("errorprone_java") {
     jar_path = "lib/error_prone_ant-$version.jar"
   }

third_party/errorprone/README.chromium

 Name: Error Prone
 Short Name: errorprone
 URL: http://errorprone.info/
-Version: 2.3.0
-Date: April 19, 2018
+Version: 2.3.1
+Date: April 23, 2018
 License: Apache 2.0
 License File: NOT_SHIPPED
 Security Critical: no