Fix flakiness in WebstoreProviderTest.

chrome/browser/ui/app_list/search/webstore/webstore_provider_browsertest.cc

Index: chrome/browser/ui/app_list/search/webstore/webstore_provider_browsertest.cc
diff --git a/chrome/browser/ui/app_list/search/webstore/webstore_provider_browsertest.cc b/chrome/browser/ui/app_list/search/webstore/webstore_provider_browsertest.cc
index 22dfef9fa15d4a5ae364ff0897a18f6fc534b68a..e8160aa26c4f4d2874ffa1061e15b4ea178a4a7d 100644
--- a/chrome/browser/ui/app_list/search/webstore/webstore_provider_browsertest.cc
+++ b/chrome/browser/ui/app_list/search/webstore/webstore_provider_browsertest.cc
@@ -162,11 +162,10 @@ class WebstoreProviderTest : public InProcessBrowserTest {
 
   void RunQuery(const std::string& query,
                 const std::string& mock_server_response) {
+    mock_server_response_ = mock_server_response;
     webstore_provider_->Start(false, base::UTF8ToUTF16(query));
 
     if (webstore_provider_->query_pending_ && !mock_server_response.empty()) {
-      mock_server_response_ = mock_server_response;
-
       DCHECK(!run_loop_);
       run_loop_.reset(new base::RunLoop);
       run_loop_->Run();