[fuchsia] Set timeout for no data to 15s

The timeout for no data in the Cast Streaming Receiver was incorrectly
set to 10s. It should have been 15s.

Bug: 1143508
Change-Id: Ibbc56176ed848f99162c61310c8ff70c65fe0b08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506465
Auto-Submit: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822267}

fuchsia/cast_streaming/stream_consumer.cc

@@ -13,7 +13,7 @@ namespace cast_streaming {
 namespace {
 
 // Timeout to stop the Session when no data is received.
-constexpr base::TimeDelta kNoDataTimeout = base::TimeDelta::FromSeconds(10);
+constexpr base::TimeDelta kNoDataTimeout = base::TimeDelta::FromSeconds(15);
 
 }  // namespace