Remove --enable-mac-views-app-list on Mac

chrome/browser/ui/BUILD.gn

Index: chrome/browser/ui/BUILD.gn
diff --git a/chrome/browser/ui/BUILD.gn b/chrome/browser/ui/BUILD.gn
index aacb45761620cf3381c619392c36a77a44a80cf2..1d876e2d8e0103f90c99f7fbb0ea9fb5b6563807 100644
--- a/chrome/browser/ui/BUILD.gn
+++ b/chrome/browser/ui/BUILD.gn
@@ -521,6 +521,12 @@ source_set("ui") {
                              ".",
                              "//chrome")
     }
+    if (!is_mac) {

[msw, 2016/05/05 01:51:06]

This is a bit odd (I first thought "Why not if toolkit_views?", but I guess we
don't want to compile this on Mac views either); hopefully it'll just become "if
(is_chromeos)" soon anyway, so I guess it's fine.

[tapted, 2016/05/05 02:53:42]

Yup, in fact ui_app_list_views_sources can then just be folded into
ui_app_list_sources, but we're blocked on having a build where we can test with
enable_app_list=0

+      sources +=
+          rebase_path(gypi_values.chrome_browser_ui_app_list_views_sources,
+                      ".",
+                      "//chrome")
+    }
     deps += [ "//ui/app_list" ]
   } else {
     sources += rebase_path(gypi_values.chrome_browser_ui_non_app_list_sources,