observeUseCounter returns a Promise<boolean>

internals.idl previously had Promise<bool>
but bool is not a Web IDL type.

Change-Id: If3541adc87e246a1933f5414e34d1025b32469b6
Reviewed-on: https://chromium-review.googlesource.com/c/1337133Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608559}

third_party/blink/renderer/core/testing/internals.idl

@@ -362,7 +362,7 @@ enum EffectiveConnectionType {
     // Returns a promise that is resolved when |feature| is counted on
     // |document|'s UseCounter. When |feature| was already counted, it's
     // immediately resolved.
-    [CallWith=ScriptState] Promise<bool> observeUseCounter(Document document, unsigned long feature);
+    [CallWith=ScriptState] Promise<boolean> observeUseCounter(Document document, unsigned long feature);
 
     readonly attribute unsigned long length;
     getter long (unsigned long index);