Fix the toolkit_views gyp variable define mania.

chrome/chrome_browser.gypi

Index: chrome/chrome_browser.gypi
diff --git a/chrome/chrome_browser.gypi b/chrome/chrome_browser.gypi
index f358fe8522d9c7f1be14863e2e1b66c49b216bf7..c26b345b8b9cb8aeea02aa8693837f62ca506aff 100644
--- a/chrome/chrome_browser.gypi
+++ b/chrome/chrome_browser.gypi
@@ -3078,7 +3078,10 @@
                 ['exclude', '^browser/browser_list_gtk.cc'],
               ],
             }],
-            ['OS=="linux" and toolkit_views==1', {
+            # These GTK files haven't been ported to views, while ChromeOS has
+            # its own separate implementation below.  So re-include them only on
+            # non-ChromeOS views Linux builds.
+            ['OS=="linux" and chromeos==0 and toolkit_views==1', {
               'sources/': [
                 ['include', '^browser/gtk/dialogs_gtk.cc'],
                 ['include', '^browser/gtk/external_protocol_dialog_gtk.cc'],