Clipboard: Use more base::Contains.

Small/Simple refactoring change. No functional changes.

Change-Id: Idd64a7cf2fb76a34b8518246087f6becc11f1c52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885976
Commit-Queue: Darwin Huang <huangdarwin@chromium.org>
Auto-Submit: Darwin Huang <huangdarwin@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710596}

headless/lib/browser/headless_clipboard.cc

@@ -25,8 +25,7 @@ uint64_t HeadlessClipboard::GetSequenceNumber(
 
 bool HeadlessClipboard::IsFormatAvailable(const ui::ClipboardFormatType& format,
                                           ui::ClipboardBuffer buffer) const {
-  const DataStore& store = GetStore(buffer);
-  return store.data.find(format) != store.data.end();
+  return base::Contains(GetStore(buffer).data, format);
 }
 
 void HeadlessClipboard::Clear(ui::ClipboardBuffer buffer) {

ui/base/clipboard/clipboard_ozone.cc

@@ -336,12 +336,7 @@ bool ClipboardOzone::IsFormatAvailable(const ClipboardFormatType& format,
   DCHECK(CalledOnValidThread());
 
   auto available_types = async_clipboard_ozone_->RequestMimeTypes(buffer);
-  for (auto mime_type : available_types) {
-    if (format.ToString() == mime_type) {
-      return true;
-    }
-  }
-  return false;
+  return base::Contains(available_types, format.ToString());
 }
 
 void ClipboardOzone::Clear(ClipboardBuffer buffer) {