None of these operating systems are fuchsia

build/config/BUILDCONFIG.gn

Index: build/config/BUILDCONFIG.gn
diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
index db070eb750cff1783ba40ad12a982b29dd9ea825..175eafb13e74a949a06a924cbcf91ac63e348616 100644
--- a/build/config/BUILDCONFIG.gn
+++ b/build/config/BUILDCONFIG.gn
@@ -268,6 +268,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
     current_os == "winrt_81_phone" || current_os == "winrt_10") {
   is_android = false
   is_chromeos = false
+  is_fuchsia = false
   is_ios = false
   is_linux = false
   is_mac = false
@@ -276,6 +277,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
   is_win = true
 } else if (current_os == "mac") {
   is_android = false
+  is_fuchsia = false
   is_chromeos = false
   is_ios = false
   is_linux = false
@@ -285,6 +287,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
   is_win = false
 } else if (current_os == "android") {
   is_android = true
+  is_fuchsia = false
   is_chromeos = false
   is_ios = false
   is_linux = false
@@ -294,6 +297,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
   is_win = false
 } else if (current_os == "chromeos") {
   is_android = false
+  is_fuchsia = false
   is_chromeos = true
   is_ios = false
   is_linux = true
@@ -307,6 +311,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
   # Posix variant.
   is_android = false
   is_chromeos = false
+  is_fuchsia = false
   is_ios = false
   is_linux = false
   is_mac = false
@@ -316,6 +321,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
 } else if (current_os == "ios") {
   is_android = false
   is_chromeos = false
+  is_fuchsia = false
   is_ios = true
   is_linux = false
   is_mac = false
@@ -325,6 +331,7 @@ if (current_os == "win" || current_os == "winrt_81" ||
 } else if (current_os == "linux") {
   is_android = false
   is_chromeos = false
+  is_fuchsia = false
   is_ios = false
   is_linux = true
   is_mac = false