Reland of Deduplicate Monochrome locale .paks

chrome/browser/chrome_browser_main_android.cc

Index: chrome/browser/chrome_browser_main_android.cc
diff --git a/chrome/browser/chrome_browser_main_android.cc b/chrome/browser/chrome_browser_main_android.cc
index 7c71f4f1c95032521e7184b07381f9bef3d46057..27f240e04df841398955305bc3c083e2f877828f 100644
--- a/chrome/browser/chrome_browser_main_android.cc
+++ b/chrome/browser/chrome_browser_main_android.cc
@@ -80,6 +80,10 @@ int ChromeBrowserMainPartsAndroid::PreCreateThreads() {
             crash_dump_dir, kAndroidMinidumpDescriptor));
   }
 
+  // Auto-detect based on en-US whether secondary locale .pak files exist.
+  ui::SetLoadSecondaryLocalePaks(
+      !ui::GetPathForAndroidLocalePakWithinApk("en-US").empty());
+
   return ChromeBrowserMainParts::PreCreateThreads();
 }