Linux: App windows with frame: chrome and no color are now native.

apps/app_window_browsertest.cc

Index: apps/app_window_browsertest.cc
diff --git a/apps/app_window_browsertest.cc b/apps/app_window_browsertest.cc
index cc411551ceb908cf440f5a0f220ffb49b677b6af..4c417c780373f85755e62795b9ad2b0244523ba8 100644
--- a/apps/app_window_browsertest.cc
+++ b/apps/app_window_browsertest.cc
@@ -13,7 +13,10 @@ namespace {
 
 typedef extensions::PlatformAppBrowserTest AppWindowBrowserTest;
 
-#if defined(TOOLKIT_GTK)
+// This test is disabled on Linux because of the unpredictable nature of native
+// windows. We cannot assume that the window manager will insert any title bar
+// at all, so the test may fail on certain window managers.
+#if defined(TOOLKIT_GTK) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
 #define MAYBE_FrameInsetsForDefaultFrame DISABLED_FrameInsetsForDefaultFrame
 #else
 #define MAYBE_FrameInsetsForDefaultFrame FrameInsetsForDefaultFrame
@@ -33,7 +36,10 @@ IN_PROC_BROWSER_TEST_F(AppWindowBrowserTest, MAYBE_FrameInsetsForDefaultFrame) {
   CloseAppWindow(app_window);
 }
 
-#if defined(TOOLKIT_GTK)
+// This test is also disabled on Linux because frame: color is ignored on stable
+// and beta channels (so it can fail the same as the previous test).
+// TODO(benwells): Re-enable on Linux after frame: color is on stable.
+#if defined(TOOLKIT_GTK) || (defined(OS_LINUX) && !defined(OS_CHROMEOS))
 #define MAYBE_FrameInsetsForColoredFrame DISABLED_FrameInsetsForColoredFrame
 #else
 #define MAYBE_FrameInsetsForColoredFrame FrameInsetsForColoredFrame