fix build with enable_web_intents=0 on chromeos

chrome/browser/chromeos/extensions/external_filesystem_apitest.cc

Index: chrome/browser/chromeos/extensions/external_filesystem_apitest.cc
diff --git a/chrome/browser/chromeos/extensions/external_filesystem_apitest.cc b/chrome/browser/chromeos/extensions/external_filesystem_apitest.cc
index 4e4d974705fa3ad404b21a8ac96e8d34d1b7be34..3c0dff567bb4acbb9304e0163d949d7d131b3e81 100644
--- a/chrome/browser/chromeos/extensions/external_filesystem_apitest.cc
+++ b/chrome/browser/chromeos/extensions/external_filesystem_apitest.cc
@@ -266,6 +266,7 @@ IN_PROC_BROWSER_TEST_F(FileSystemExtensionApiTest, FileBrowserTestLazy) {
       << message_;
 }
 
+#if defined(ENABLE_WEB_INTENTS)
 IN_PROC_BROWSER_TEST_F(FileSystemExtensionApiTest, FileBrowserWebIntentTest) {
   // Create a test file inside the ScopedTempDir.
   FilePath test_file = mount_point_dir_.AppendASCII("text_file.xul");
@@ -276,6 +277,7 @@ IN_PROC_BROWSER_TEST_F(FileSystemExtensionApiTest, FileBrowserWebIntentTest) {
                                         "webintent_handler"))
       << message_;
 }
+#endif
 
 IN_PROC_BROWSER_TEST_F(FileSystemExtensionApiTest, FileBrowserTestWrite) {
   ASSERT_TRUE(RunFileBrowserHandlerTest("write.html",