Fix crash for CHECK

Headers are not yet populated so this CHECK is going to fail. Remove
it until the rest of the changes land.

Bug: b:343737170
Change-Id: Ia079dfcd581479a6bae19c0b6a14a7ffc897e191
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5858815
Reviewed-by: Yongshun Liu <yongshun@chromium.org>
Commit-Queue: Yongshun Liu <yongshun@chromium.org>
Commit-Queue: Sean Kau <skau@chromium.org>
Auto-Submit: Sean Kau <skau@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1354926}

google_apis/youtube_music/youtube_music_api_request_types.cc

@@ -282,7 +282,8 @@ HttpRequestMethod SignedRequest::GetRequestType() const {
 }
 
 std::vector<std::string> SignedRequest::GetExtraRequestHeaders() const {
-  CHECK(!headers_.empty());
+  // TODO(b/343737170): CHECK that headers are non-empty when we can guarntee
+  // that the headers are always present.
   return headers_;
 }