Remove guava from chromium.

third_party/guava/proguard.flags

-# Copyright 2013 The Chromium Authors. All rights reserved.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
--keep class com.google.common.annotations.VisibleForTesting,
-            com.google.common.base.Preconditions,
-            com.google.common.base.Objects,
-            com.google.common.base.Strings,
-            com.google.common.base.Supplier {
-    *;
-}
-
--keepattributes Signature
-
-# Don't complain about usage of sun.misc.Unsafe. Guava imports this,
-# but does not use it unless it exists.
-# The gyp-target that uses this is guava.gyp:guava_javalib.
--dontwarn sun.misc.Unsafe
-# Striped64 uses reflection to access some local fields.
--dontnote com.google.common.cache.Striped64
--dontnote com.google.common.cache.Striped64$Cell
-
-# Keep all enum values and valueOf methods. See
-# http://proguard.sourceforge.net/index.html#manual/examples.html
-# for the reason for this. Also, see http://crbug.com/248037.
--keepclassmembers enum * {
-    public static **[] values();
-    public static ** valueOf(java.lang.String);
-}
-
-# Keep finalizer stuff from google-common used via reflection
--keepclassmembers class com.google.common.** {
-  *** finalizeReferent();
-}
--keepclassmembers class com.google.common.** {
-  *** startFinalizer(java.lang.Class,java.lang.Object);
-}