Increase answers cache size.

BUG=none
TBR=pkasting@chromium.org

Review URL: https://codereview.chromium.org/597433002

Cr-Commit-Position: refs/heads/master@{#296266}

components/omnibox/search_provider.cc

@@ -128,7 +128,7 @@ SearchProvider::SearchProvider(
       listener_(listener),
       suggest_results_pending_(0),
       providers_(template_url_service),
-      answers_cache_(1) {
+      answers_cache_(10) {
 }
 
 // static