Revert of [build] Introduce an embedder version string

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index d6e5d94e83b9fe8cde8c4c1bb2dacd4108db40fb..2347be6be86af5af240b6f0f2d72ca3e4f03ff55 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 = ""
@@ -176,10 +173,6 @@
   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" ]