Delete ChromeOS code

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1926163002

Review-Url: https://codereview.chromium.org/1926163002
diff --git a/gyp/debugger.gyp b/gyp/debugger.gyp
index f6e1988..8ad5702 100644
--- a/gyp/debugger.gyp
+++ b/gyp/debugger.gyp
@@ -6,7 +6,7 @@
   'variables': {
     'skia_warnings_as_errors': 0,
     'conditions': [
-      [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
+      [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris"]', {
         # Use the systemwide Qt libs by default
         'variables': {
           'qt_sdk%': '/usr',