Revert "Quick Answers: Add page size options for Search request"

This reverts commit 8144dae3.

Reason for revert: breaks unit tests in this build:
https://ci.chromium.org/ui/p/chrome/builders/ci/linux-chromeos-chrome/10489/overview

Original change's description:
> Quick Answers: Add page size options for Search request
>
> Since we only use the first result from search request, set the page
> size to 1 to reduce the delay.
>
> Bug: b/173239982
> Test: None
> Change-Id: Ib2abd92e23b430b837f0556c31bcc0d17873256e
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2574072
> Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
> Reviewed-by: Jeroen Dhollander <jeroendh@chromium.org>
> Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
> Commit-Queue: Yue Li <updowndota@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#833940}

TBR=xiyuan@chromium.org,xiaohuic@chromium.org,updowndota@chromium.org,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com,jeroendh@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: b/173239982
Change-Id: I4348e98fcc27160c01ecf4a9c048844861f5c15c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2576659Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834097}

chromeos/components/quick_answers/search_result_loader.cc

@@ -30,9 +30,6 @@ using network::mojom::URLLoaderFactory;
 //   "client_id": {
 //     "client_type": "EXPERIMENTAL"
 //   }
-//   "options": {
-//     "page_size": "1"
-//   }
 // }
 //
 // Which is:
@@ -41,17 +38,12 @@ using network::mojom::URLLoaderFactory;
 //      "raw_query": STRING
 //   "client_id": DICT
 //       "client_type": STRING
-//   "options": DICT
-//       "page_size": STRING
 
 constexpr base::StringPiece kQueryKey = "query";
 constexpr base::StringPiece kRawQueryKey = "rawQuery";
 constexpr base::StringPiece kClientTypeKey = "clientType";
 constexpr base::StringPiece kClientIdKey = "clientId";
 constexpr base::StringPiece kClientType = "QUICK_ANSWERS_CROS";
-constexpr base::StringPiece kPageSizeKey = "pageSize";
-constexpr base::StringPiece kOptionsKey = "options";
-constexpr base::StringPiece kPageSize = "1";
 
 std::string BuildSearchRequestPayload(const std::string& selected_text) {
   Value payload(Value::Type::DICTIONARY);
@@ -65,10 +57,6 @@ std::string BuildSearchRequestPayload(const std::string& selected_text) {
   client_id.SetKey(kClientTypeKey, Value(kClientType));
   payload.SetKey(kClientIdKey, std::move(client_id));
 
-  Value options(Value::Type::DICTIONARY);
-  options.SetKey(kPageSizeKey, Value(kPageSize));
-  payload.SetKey(kOptionsKey, std::move(options));
-
   std::string request_payload_str;
   base::JSONWriter::Write(payload, &request_payload_str);