Enable -Wtautological-bitwise-compare on cros too.

Might work after #721015.

Bug: 1024203
Change-Id: I9403a404c0027394e2256b51df5c6835dd03bb59
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1948494
Commit-Queue: Nico Weber <thakis@chromium.org>
Commit-Queue: Reid Kleckner <rnk@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Reviewed-by: Reid Kleckner <rnk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#721117}

build/config/compiler/BUILD.gn

@@ -1543,12 +1543,6 @@ config("default_warnings") {
             "-Wno-c99-designator",
           ]
         }
-        if (is_chromeos) {
-          cflags += [
-            # TODO(https://crbug.com/1024203): Clean up, enable.
-            "-Wno-tautological-bitwise-compare",
-          ]
-        }
         if (is_win) {
           cflags += [
             # TODO(https://crbug.com/1002945): Clean up, enable.