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 4a5067a020fec3f5ec10da98e1b28601d23ca978..d8cd6a250f3ac91b0e21b278e0234e2da2439a0c 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/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("//chrome/process_version_rc_template.gni")  # For branding_file_path.
 import("//testing/test.gni")
 import("//third_party/icu/config.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ -377,6 +378,10 @@ 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",