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

chrome/android/BUILD.gn

Index: chrome/android/BUILD.gn
diff --git a/chrome/android/BUILD.gn b/chrome/android/BUILD.gn
index 6a547db908a3762469340251e891776861e8f179..0a1a5819b48861b20379e4e05a0b5d4ba9674ab0 100644
--- a/chrome/android/BUILD.gn
+++ b/chrome/android/BUILD.gn
@@ -4,10 +4,11 @@
 
 import("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
+import("//build/config/chrome_build.gni")
+import("//build/util/process_version.gni")
 import("//build_overrides/v8.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/common/features.gni")
-import("//chrome/version.gni")
 import("//testing/test.gni")
 import("//third_party/icu/config.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ -376,6 +377,10 @@ chrome_version_java_dir = "$root_gen_dir/templates/chrome_version_java"
 chrome_version_java_file = "$chrome_version_java_dir/org/chromium/chrome/browser/ChromeVersionConstants.java"
 process_version("chrome_version_java") {
   template_file = "java/ChromeVersionConstants.java.version"
+  sources = [
+    "//chrome/VERSION",
+    branding_file_path,
+  ]
   output = chrome_version_java_file
   extra_args = [
     "-e",