media: disable VP9 k-SVC hw encoding by default in Lacros

Zero copy video capture is currently disabled in Lacros so VP9 k-SVC
encoding should be disabled too since it only works with zero copy video
capture.

This change will fix some vaapi encoder crashes that have been reported
when using Meet in Lacros.

BUG=b:214589754, 1286935, 1285758
TEST=manual test in volteer

(cherry picked from commit 1130998)

Change-Id: Ic970dd01da26f61007f07d8c0cab530ef387b05e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3530367
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Reviewed-by: Dan Sanders <sandersd@chromium.org>
Commit-Queue: Pilar Molina Lopez <pmolinalopez@google.com>
Cr-Original-Commit-Position: refs/heads/main@{#981955}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3542748
Auto-Submit: Pilar Molina Lopez <pmolinalopez@google.com>
Owners-Override: Srinivas Sista <srinivassista@chromium.org>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/4896@{#797}
Cr-Branched-From: 1f63ff4-refs/heads/main@{#972766}

media/base/media_switches.cc

@@ -529,8 +529,14 @@ const base::Feature kVaapiH264TemporalLayerHWEncoding{
 const base::Feature kVaapiVp8TemporalLayerHWEncoding{
     "VaapiVp8TemporalLayerEncoding", base::FEATURE_DISABLED_BY_DEFAULT};
 // Enable VP9 k-SVC encoding with HW encoder for webrtc use case on ChromeOS.
-const base::Feature kVaapiVp9kSVCHWEncoding{"VaapiVp9kSVCHWEncoding",
-                                            base::FEATURE_ENABLED_BY_DEFAULT};
+const base::Feature kVaapiVp9kSVCHWEncoding {
+  "VaapiVp9kSVCHWEncoding",
+#if BUILDFLAG(IS_CHROMEOS_ASH)
+      base::FEATURE_ENABLED_BY_DEFAULT
+#else
+      base::FEATURE_DISABLED_BY_DEFAULT
+#endif  // BUILDFLAG(IS_CHROMEOS_ASH)
+};
 #endif  // defined(ARCH_CPU_X86_FAMILY) && BUILDFLAG(IS_CHROMEOS)
 
 // Inform video blitter of video color space.