[lacros] Remove superfluous !is_chromeos from is_linux conditions

is_linux is no longer defined for Chrome OS.

Bug: 1052397
Change-Id: I0fc4903ef2db0662bc806b543ee9cd870fe4af96
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3563860
Reviewed-by: Joe Downing <joedow@chromium.org>
Auto-Submit: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Commit-Queue: Thomas Anderson <thomasanderson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#987712}
NOKEYCHECK=True
GitOrigin-RevId: 22a00ebba6dd5ffb96992a1beca9b980240d7ddb
diff --git a/third_party/libc++/BUILD.gn b/third_party/libc++/BUILD.gn
index dec348e..a53cc90 100644
--- a/third_party/libc++/BUILD.gn
+++ b/third_party/libc++/BUILD.gn
@@ -54,7 +54,7 @@
     "//build/config:common_deps",
     "//third_party/catapult/devil:devil",
   ]
-  if (is_linux && !is_chromeos) {
+  if (is_linux) {
     # This target packages libc++.so, so must have an explicit dependency on
     # libc++.
     visibility +=