Revert of gn: Generalize process_version() and move it to build/util

android_webview/common/BUILD.gn

Index: android_webview/common/BUILD.gn
diff --git a/android_webview/common/BUILD.gn b/android_webview/common/BUILD.gn
index 3ef5f80a9318fa859beb71e8d968ef0085c8fdee..4be51790174fed0d15fded6cd6fea3ec0e704362 100644
--- a/android_webview/common/BUILD.gn
+++ b/android_webview/common/BUILD.gn
@@ -2,12 +2,9 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import("//build/util/process_version.gni")
+import("//chrome/version.gni")
 
 process_version("version") {
-  sources = [
-    "//chrome/VERSION",
-  ]
   template_file = "aw_version_info_values.h.version"
   output = "$root_gen_dir/android_webview/common/aw_version_info_values.h"
 }