[gin] Unify snapshot loading on Windows and other platforms.

gin/BUILD.gn

Index: gin/BUILD.gn
diff --git a/gin/BUILD.gn b/gin/BUILD.gn
index 4da04284e3f69845f17428ae65d45b656bab758f..88fa40a8b3b6d0298e0ba97356aeb030ce3243a6 100644
--- a/gin/BUILD.gn
+++ b/gin/BUILD.gn
@@ -86,11 +86,6 @@ component("gin") {
     "//base/third_party/dynamic_annotations",
     "//crypto",
   ]
-  if (v8_use_external_startup_data && is_win) {
-    public_deps += [ ":gin_v8_snapshot_fingerprint" ]
-    sources += [ "$target_gen_dir/v8_snapshot_fingerprint.cc" ]
-    defines += [ "V8_VERIFY_EXTERNAL_STARTUP_DATA" ]
-  }
 
   if (is_mac) {
     libs = [ "CoreFoundation.framework" ]
@@ -99,36 +94,6 @@ component("gin") {
   configs += [ "//v8:external_startup_data" ]
 }
 
-if (v8_use_external_startup_data) {
-  action("gin_v8_snapshot_fingerprint") {
-    script = "//gin/fingerprint/fingerprint_v8_snapshot.py"
-
-    snapshot_file = "$root_out_dir/snapshot_blob.bin"
-    natives_file = "$root_out_dir/natives_blob.bin"
-    output_file = "$target_gen_dir/v8_snapshot_fingerprint.cc"
-
-    args = [
-      "--snapshot_file",
-      rebase_path(snapshot_file, root_build_dir),
-      "--natives_file",
-      rebase_path(natives_file, root_build_dir),
-      "--output_file",
-      rebase_path(output_file, root_build_dir),
-    ]
-    inputs = [
-      snapshot_file,
-      natives_file,
-    ]
-    outputs = [
-      output_file,
-    ]
-
-    deps = [
-      "//v8",
-    ]
-  }
-}
-
 executable("gin_shell") {
   sources = [
     "shell/gin_main.cc",