[Mojo] Remove mojo_view_manager_unittests from mojob

These tests currently crash.

R=viettrungluu@chromium.org

Review URL: https://codereview.chromium.org/637953009

Cr-Commit-Position: refs/heads/master@{#300328}

mojo/tools/data/unittests

@@ -16,7 +16,8 @@ mojo_public_utility_unittests
 mojo_application_manager_unittests
 mojo_common_unittests
 mojo_view_manager_lib_unittests
-mojo_view_manager_unittests
+# These tests currently crash. We should re-enable them when they pass.
+#mojo_view_manager_unittests
 mojo_surfaces_lib_unittests
 
 # JavaScript tests: