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This CL makes the "text" param in chrome.browserAction.setBadgeText
optional. Setting text to be null (or not specifying it) removes the
explicitly set badge text for a given tab. The tab's badge text will
then be removed, or will show the default non-tab-specific badge text if
set.

Bug: 1002961
Change-Id: I7f9f4ef2ac3187fff0b06455fd4abcc1db0a5143
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067641
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748366}