Copy variables.sh for all signing script targets.

chrome/installer/mac/BUILD.gn

Index: chrome/installer/mac/BUILD.gn
diff --git a/chrome/installer/mac/BUILD.gn b/chrome/installer/mac/BUILD.gn
index d6ad7cf1323343eda62a9fec350b658d51ba2251..616dee3ba6c8a743738e7b77326a5ea1bae70064 100644
--- a/chrome/installer/mac/BUILD.gn
+++ b/chrome/installer/mac/BUILD.gn
@@ -26,6 +26,10 @@ action("make_signers") {
   script = "//build/gn_run_binary.py"
   shell_script = "//chrome/installer/mac/make_signers.sh"
 
+  deps = [
+    ":copy_variables",
+  ]
+
   inputs = [
     script,
     shell_script,
@@ -49,10 +53,24 @@ action("make_signers") {
   ]
 }
 
+copy("copy_variables") {
+  visibility = [
+    ":make_signers",
+    ":copies",
+  ]
+  sources = [
+    "variables.sh",
+  ]
+  outputs = [
+    "$_packaging_dir/{{source_file_part}}",
+  ]
+}
+
 copy("copies") {
   visibility = [ ":mac" ]
 
   deps = [
+    ":copy_variables",
     "//chrome/installer/mac/third_party/bsdiff:goobsdiff",
     "//chrome/installer/mac/third_party/bsdiff:goobspatch",
     "//chrome/installer/mac/third_party/xz:lzma_decompress",
@@ -71,7 +89,6 @@ copy("copies") {
     "dmgdiffer.sh",
     "pkg-dmg",
     "sign_installer_tools.sh",
-    "variables.sh",
   ]
 
   if (is_chrome_branded) {