Throw exception when initialization failed.

chrome/app/android/chrome_main_delegate_android.cc

Index: chrome/app/android/chrome_main_delegate_android.cc
diff --git a/chrome/app/android/chrome_main_delegate_android.cc b/chrome/app/android/chrome_main_delegate_android.cc
index bf28f4ab91b5339e8a59d3f89b576e6514e58eef..2d82ba9f85b22e91244f6355ee5dbed20fc1872b 100644
--- a/chrome/app/android/chrome_main_delegate_android.cc
+++ b/chrome/app/android/chrome_main_delegate_android.cc
@@ -40,12 +40,7 @@ int ChromeMainDelegateAndroid::RunProcess(
     RegisterApplicationNativeMethods(env);
 
     browser_runner_.reset(content::BrowserMainRunner::Create());
-    int exit_code = browser_runner_->Initialize(main_function_params);
-    DCHECK(exit_code < 0);
-
-    // Return 0 so that we do NOT trigger the default behavior. On Android, the
-    // UI message loop is managed by the Java application.
-    return 0;
+    return browser_runner_->Initialize(main_function_params);
   }
 
   return ChromeMainDelegate::RunProcess(process_type, main_function_params);