Revert of Auto-generate v8 version based on tags.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 6822f30ab306419c36f1981b85956bc4c47824a9..a524ba10a3e7a1cfa792952756940263118c8031 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -314,25 +314,6 @@
   }
 }
 
-action("generate_v8_version") {
-  visibility = [ ":*" ]  # Only targets in this file can depend on this.
-
-  script = "tools/push-to-trunk/generate_version.py"
-
-  sources = [
-    "src/version.cc",
-  ]
-
-  outputs = [
-    "$target_gen_dir/version.cc"
-  ]
-
-  args = [
-    rebase_path("$target_gen_dir/version.cc", root_build_dir),
-  ]
-}
-
-
 ###############################################################################
 # Source Sets (aka static libraries)
 #
@@ -417,7 +398,6 @@
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
   sources = [
-    "$target_gen_dir/version.cc",
     "src/accessors.cc",
     "src/accessors.h",
     "src/allocation.cc",
@@ -953,6 +933,7 @@
     "src/v8threads.h",
     "src/variables.cc",
     "src/variables.h",
+    "src/version.cc",
     "src/version.h",
     "src/vm-state-inl.h",
     "src/vm-state.h",
@@ -1230,7 +1211,6 @@
   defines = []
   deps = [
     ":v8_libbase",
-    ":generate_v8_version",
   ]
 
   if (is_win) {