[Android] Further speculative fixes for search engine crashes.

chrome/browser/search_engines/template_url_service_android.cc

Index: chrome/browser/search_engines/template_url_service_android.cc
diff --git a/chrome/browser/search_engines/template_url_service_android.cc b/chrome/browser/search_engines/template_url_service_android.cc
index bccd8d7dd2ad17d4fa74efd31e570c5b5b4bac89..a5b5b391551767cc8d143bcd9ab182c4e37c27f7 100644
--- a/chrome/browser/search_engines/template_url_service_android.cc
+++ b/chrome/browser/search_engines/template_url_service_android.cc
@@ -301,7 +301,8 @@ TemplateUrlServiceAndroid::GetSearchEngineUrlFromTemplateUrl(
       base::android::ConvertJavaStringToUTF16(env, jkeyword);
   TemplateURL* template_url =
       template_url_service_->GetTemplateURLForKeyword(keyword);
-  CHECK(template_url) << "Failed to find template URL for keyword: " << keyword;
+  if (!template_url)
+    return base::android::ScopedJavaLocalRef<jstring>(env, nullptr);
   std::string url(template_url->url_ref().ReplaceSearchTerms(
       TemplateURLRef::SearchTermsArgs(base::ASCIIToUTF16("query")),
       template_url_service_->search_terms_data()));