Disable TracingPreferencesTest#testSelectCategories for KitKat and below

Currently flaky on KitKat phone tester bot.

BUG=908118
TBR=twellington@chromium.org,eseckler@chromium.org
NOTRY=true

Change-Id: Id8a76dafef89d1f2098e1e9a0ebe8fd1b78c8b86
Reviewed-on: https://chromium-review.googlesource.com/c/1349654
Commit-Queue: Tim Volodine <timvolodine@chromium.org>
Reviewed-by: Tim Volodine <timvolodine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610641}

chrome/android/javatests/src/org/chromium/chrome/browser/preferences/developer/TracingPreferencesTest.java

@@ -276,6 +276,7 @@ public class TracingPreferencesTest {
     @MediumTest
     @Feature({"Preferences"})
     @Features.EnableFeatures(ChromeFeatureList.DEVELOPER_PREFERENCES)
+    @DisableIf.Build(sdk_is_less_than = 21, message = "crbug.com/908118")
     public void testSelectCategories() throws Exception {
         Context context = ContextUtils.getApplicationContext();
         // We need a renderer so that its tracing categories will be populated.