Don't build a bunch of stuff on Aura, rather than ifdefing out code in it.

chrome/browser/plugin_test.cc

 // Copyright (c) 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.
 
 // Tests for the top plugins to catch regressions in our plugin host code, as
 // well as in the out of process code.  Currently this tests:
 //  Flash
 //  Real
 //  QuickTime
 //  Windows Media Player
@@ skipping 14 matching lines @@
 #include <string.h>
 #include <memory.h>
 
 #include <string>
 
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/message_loop.h"
 #include "base/path_service.h"
 #include "base/test/test_timeouts.h"
-#include "chrome/browser/plugin_download_helper.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/test/automation/automation_proxy.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/base/ui_test_utils.h"
 #include "chrome/test/ui/ui_test.h"
 #include "content/browser/net/url_request_mock_http_job.h"
 #include "net/base/net_util.h"
 #include "net/url_request/url_request_context_getter.h"
 #include "net/url_request/url_request_test_util.h"
 #include "third_party/npapi/bindings/npapi.h"
 #include "webkit/plugins/npapi/plugin_constants_win.h"
 #include "webkit/plugins/npapi/plugin_list.h"
 #include "webkit/plugins/plugin_switches.h"
 
 #if defined(OS_WIN)
 #include "base/win/registry.h"
+#include "chrome/browser/plugin_download_helper.h"
 #endif
 
 class PluginTest : public UITest {
  public:
   // Generate the URL for testing a particular test.
   // HTML for the tests is all located in test_directory\plugin\<testcase>
   // Set |mock_http| to true to use mock HTTP server.
   static GURL GetTestUrl(const std::string& test_case,
                          const std::string& query,
                          bool mock_http) {
@@ skipping 273 matching lines @@
 TEST_F(PluginInstallerDownloadTest, PluginInstallerDownloadPathTest) {
   MessageLoop loop(MessageLoop::TYPE_IO);
   Start();
   loop.Run();
 
   EXPECT_TRUE(success());
   EXPECT_TRUE(initial_download_path().BaseName().value() ==
               final_download_path().BaseName().value());
 }
 #endif  // defined(OS_WIN)