Remove all blimp client code.

blimp/client/test/contents/mock_blimp_contents_observer.cc

Index: blimp/client/test/contents/mock_blimp_contents_observer.cc
diff --git a/blimp/client/test/contents/mock_blimp_contents_observer.cc b/blimp/client/test/contents/mock_blimp_contents_observer.cc
deleted file mode 100644
index 9a8d0c387f9630c9dba1ea3f4ea0d0003c8181c2..0000000000000000000000000000000000000000
--- a/blimp/client/test/contents/mock_blimp_contents_observer.cc
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2016 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.
-
-#include "blimp/client/test/contents/mock_blimp_contents_observer.h"
-
-namespace blimp {
-namespace client {
-
-MockBlimpContentsObserver::MockBlimpContentsObserver(BlimpContents* contents)
-    : BlimpContentsObserver(contents) {}
-
-MockBlimpContentsObserver::~MockBlimpContentsObserver() = default;
-
-}  // namespace client
-}  // namespace blimp