perfetto-ui: Temporarily disable browser tests on Travis

They seem to be broken for some reason.

Change-Id: Ib58f25eb674ad9ecb2e3a15ab6dc973c10be6c0f
diff --git a/.travis.yml b/.travis.yml
index 66b04ab..c3c153a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -150,7 +150,7 @@
     perfetto_unittests
     "
     if [[ "$CFG" == ui-* ]]; then
-      out/dist/ui_tests --ci
+      out/dist/ui_unittests --ci
     elif [[ "$CFG" == android-* ]]; then
       TARGET_ARCH=$(echo $CFG | cut -d- -f3)
       tools/run_android_emulator --pid /tmp/emulator.pid -v &