[websocket] Replace uses of deprecatedByteLengthAsUnsigned

Using byteLengthAsSizeT should not be a problem here, as the receivers
are already either of type size_t or uint64_t.

R=haraken@chromium.org

Bug: chromium:1008840
Change-Id: I805e58ee5d42fc95fb2c3ab262796945b01264a5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975874Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726346}

third_party/blink/renderer/modules/websockets/dom_websocket.cc

@@ -377,16 +377,14 @@ void DOMWebSocket::send(NotShared<DOMArrayBufferView> array_buffer_view,
   }
   if (common_.GetState() == kClosing || common_.GetState() == kClosed) {
     UpdateBufferedAmountAfterClose(
-        array_buffer_view.View()->deprecatedByteLengthAsUnsigned());
+        array_buffer_view.View()->byteLengthAsSizeT());
     return;
   }
   RecordSendTypeHistogram(kWebSocketSendTypeArrayBufferView);
-  RecordSendMessageSizeHistogram(
-      kWebSocketSendTypeArrayBufferView,
-      array_buffer_view.View()->deprecatedByteLengthAsUnsigned());
+  RecordSendMessageSizeHistogram(kWebSocketSendTypeArrayBufferView,
+                                 array_buffer_view.View()->byteLengthAsSizeT());
   DCHECK(channel_);
-  buffered_amount_ +=
-      array_buffer_view.View()->deprecatedByteLengthAsUnsigned();
+  buffered_amount_ += array_buffer_view.View()->byteLengthAsSizeT();
   channel_->Send(*array_buffer_view.View()->buffer(),
                  array_buffer_view.View()->byteOffsetAsSizeT(),
                  array_buffer_view.View()->byteLengthAsSizeT(),