ui/base/models: Switch to ASSERT_* instead of EXPECT_* in tree_node_model_unittest.cc
ui/base/models: Switch to ASSERT_* instead of EXPECT_* in tree_node_model_unittest.cc

First reason is because doesn't make sense to continue when the assertions in
question fails. Second reason is because we are already using more ASSERT_* checks
than EXPECT_*. So this change makes everything using ASSERT_* rather than EXPECT_*.

BUG=None
TEST=ui_unittests --gtest_filter=TreeNodeModelTest.*

R=sky@chromium.org

Review URL: http://codereview.chromium.org/7187016

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@89391 0039d316-1c4b-4281-b951-d872f2087c98

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