[Autofill] Instantiate FillResponseWhenNoErrors for ApiTestEnv

Before the patch:
Api_FillsResponseWhenNoErrors was mistakenly instantiated
FillResponseWhenNoErrors against the LegacyTestEnv.

This patch correctly instatates it against ApiTestEnv and does
the required modification to make it pass.

Bug: 1114655
Change-Id: I99a8463615069d3307a84190bae383e92a309c06
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2404927Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Mohamed Amir Yosef <mamir@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806116}

chrome/browser/autofill/automated_tests/cache_replayer_unittest.cc

@@ -646,9 +646,15 @@ void FillResponseWhenNoErrors(RequestType request_type) {
   std::string http_text_response;
   ASSERT_TRUE(TestEnv::GetServerResponseForQuery(
       cache_replayer, request_response_pairs[0].first, &http_text_response));
-  AutofillQueryResponseContents response_from_cache;
-  ASSERT_TRUE(response_from_cache.ParseFromString(
-      SplitHTTP(http_text_response).second));
+  std::string body = SplitHTTP(http_text_response).second;
+  if (std::is_same<TestEnv, ApiTestEnv>::value) {
+    // The Api Environment expects the response to be base64 encoded.
+    std::string tmp;
+    ASSERT_TRUE(base::Base64Decode(body, &tmp));
+    body = tmp;
+  }
+  typename TestEnv::Env::Response response_from_cache;
+  ASSERT_TRUE(response_from_cache.ParseFromString(body));
 }
 
 TEST_P(AutofillCacheReplayerGetResponseForQueryTest,
@@ -658,7 +664,7 @@ TEST_P(AutofillCacheReplayerGetResponseForQueryTest,
 
 TEST_P(AutofillCacheReplayerGetResponseForQueryTest,
        Api_FillsResponseWhenNoErrors) {
-  FillResponseWhenNoErrors<LegacyTestEnv>(GetParam());
+  FillResponseWhenNoErrors<ApiTestEnv>(GetParam());
 }
 
 INSTANTIATE_TEST_SUITE_P(GetResponseForQueryParameterizeTest,