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The current text annotation model we are using is not good at
concatenated words like "SampleClassName" and words contains special
characters like "test_example(". Since it takes time for us to roll up
to the v2 model, filter such kind of queries for now to improve the
quality.

Bug: b/159664194
Test: Manual Test
Change-Id: I203388766b160fa7f3368702e1c75683a3e148ec
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2440832
Commit-Queue: Yue Li <updowndota@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812947}