ChromeOS: Fix FATAL:variations_service.cc(428)

This CL replaces CHECK with DCHECK to prevent fatal failures in the wild.

TBR=asvitkine@chromium.org

Bug: 910833
Change-Id: I070339cb47506b2b6823b9d3f8e4a7b06fc310ff
Reviewed-on: https://chromium-review.googlesource.com/c/1357919Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613314}

components/variations/service/variations_service.cc

@@ -422,10 +422,15 @@ GURL VariationsService::GetVariationsServerURL(HttpOptions http_options) {
 }
 
 void VariationsService::EnsureLocaleEquals(const std::string& locale) {
+#if defined(OS_CHROMEOS)
+  // Chrome OS may switch language on the fly.
+  DCHECK_EQ(locale, field_trial_creator_.application_locale());
+#else
   // Uses a CHECK rather than a DCHECK to ensure that issues are caught since
   // problems in this area may only appear in the wild due to official builds
   // and end user machines.
   CHECK_EQ(locale, field_trial_creator_.application_locale());
+#endif
 }
 
 // static