Support delta-compressed variations server responses.

chrome/browser/metrics/variations/variations_service_unittest.cc

Index: chrome/browser/metrics/variations/variations_service_unittest.cc
diff --git a/chrome/browser/metrics/variations/variations_service_unittest.cc b/chrome/browser/metrics/variations/variations_service_unittest.cc
index 4e598c1de6a7979a216329cf873e580a54f3be6d..8143e973358d84df649febb94341d3a8bfb2bacc 100644
--- a/chrome/browser/metrics/variations/variations_service_unittest.cc
+++ b/chrome/browser/metrics/variations/variations_service_unittest.cc
@@ -72,10 +72,13 @@ class TestVariationsService : public VariationsService {
   }
 
  protected:
-  void StoreSeed(const std::string& seed_data,
+  bool StoreSeed(const std::string& seed_data,
                  const std::string& seed_signature,
-                 const base::Time& date_fetched) override {
+                 const std::string& country_code,
+                 const base::Time& date_fetched,
+                 bool is_delta_compressed) override {
     seed_stored_ = true;
+    return true;
   }
 
  private: