LaCrOS: Remove thread limitation on lacros-chrome.

Removes limitation on thread numbers applied to lacros-
chrome that is only necessary for linux not chrome os.

Bug: 1052397
Change-Id: I196a7ab7656cce1d79e853e1929c83ae269ae541
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2592219
Commit-Queue: Joe Downing <joedow@chromium.org>
Reviewed-by: Joe Downing <joedow@chromium.org>
Auto-Submit: Yuta Hijikata <ythjkt@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843543}

remoting/codec/webrtc_video_encoder_vpx.cc

@@ -13,6 +13,7 @@
 #include "base/memory/ptr_util.h"
 #include "base/system/sys_info.h"
 #include "build/build_config.h"
+#include "build/chromeos_buildflags.h"
 #include "remoting/base/util.h"
 #include "remoting/proto/video.pb.h"
 #include "third_party/libvpx/source/libvpx/vpx/vp8cx.h"
@@ -84,11 +85,11 @@ void SetVp8CodecParameters(vpx_codec_enc_cfg_t* config,
                            const webrtc::DesktopSize& size) {
   SetCommonCodecParameters(config, size);
 
-#if defined(OS_LINUX)
+#if defined(OS_LINUX) && !BUILDFLAG(IS_CHROMEOS_LACROS)
   // On Linux, using too many threads for VP8 encoding has been linked to high
   // CPU usage on machines that are under stress. See http://crbug.com/1151148.
   config->g_threads = std::min(config->g_threads, 2U);
-#endif  // defined(OS_LINUX)
+#endif  // defined(OS_LINUX) && !BUILDFLAG(IS_CHROMEOS_LACROS)
 
   // Value of 2 means using the real time profile. This is basically a
   // redundant option since we explicitly select real time mode when doing