Put Filter into namespace net.

net/base/gzip_filter_unittest.cc

Index: net/base/gzip_filter_unittest.cc
diff --git a/net/base/gzip_filter_unittest.cc b/net/base/gzip_filter_unittest.cc
index d07c24d3a2eab77966e151f972f691dc28805a8e..342cda42cb3017626869e7637754e2669b43ac70 100644
--- a/net/base/gzip_filter_unittest.cc
+++ b/net/base/gzip_filter_unittest.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2006-2011 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.
 
@@ -53,6 +53,8 @@ enum EncodeMode {
 
 }  // namespace
 
+namespace net {
+
 // These tests use the path service, which uses autoreleased objects on the
 // Mac, so this needs to be a PlatformTest.
 class GZipUnitTest : public PlatformTest {
@@ -391,3 +393,5 @@ TEST_F(GZipUnitTest, DecodeCorruptedHeader) {
   // Expect failures
   EXPECT_TRUE(code == Filter::FILTER_ERROR);
 }
+
+}  // namespace net