Work on getting things built with -Wimplicit-fallthrough. This CL was uploaded by git cl split.

Bug: 177475
R=mek@chromium.org

Change-Id: I027380127953f6b24b406cc8d468446053bbd151
Reviewed-on: https://chromium-review.googlesource.com/889781Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#532117}

content/browser/service_worker/service_worker_data_pipe_reader.cc

@@ -150,6 +150,7 @@ void ServiceWorkerDataPipeReader::AsyncComplete() {
   switch (state()) {
     case State::kStreaming:
       NOTREACHED();
+      break;
     case State::kCompleted:
       stream_pending_buffer_ = nullptr;
       stream_pending_buffer_size_ = 0;

content/browser/service_worker/service_worker_storage.cc

@@ -80,6 +80,7 @@ ServiceWorkerStatusCode DatabaseStatusToStatusCode(
       return SERVICE_WORKER_ERROR_NOT_FOUND;
     case ServiceWorkerDatabase::STATUS_ERROR_MAX:
       NOTREACHED();
+      FALLTHROUGH;
     default:
       return SERVICE_WORKER_ERROR_FAILED;
   }