Revert of [build] Introduce an embedder version string

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 7197da08e02d92de1f135609c7738a6b2fd2bd31..2f065a0504bc5416fe89898850d5f67c049ce662 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -28,9 +28,6 @@
 
   # Enable compiler warnings when using V8_DEPRECATED apis.
   v8_deprecation_warnings = false
-
-  # Allow the embedder to add a custom suffix to the version string.
-  v8_embedder_string = ""
 
   # Enable compiler warnings when using V8_DEPRECATE_SOON apis.
   v8_imminent_deprecation_warnings = ""
@@ -191,10 +188,6 @@
   visibility = [ ":*" ]  # Only targets in this file can depend on this.
 
   defines = []
-
-  if (v8_embedder_string != "") {
-    defines += [ "V8_EMBEDDER_STRING=\"$v8_embedder_string\"" ]
-  }
 
   if (v8_enable_disassembler) {
     defines += [ "ENABLE_DISASSEMBLER" ]