Migrate WTF::HashSet::add() to ::insert() [part 1 of N]

third_party/WebKit/Source/core/fileapi/FileReader.cpp

Index: third_party/WebKit/Source/core/fileapi/FileReader.cpp
diff --git a/third_party/WebKit/Source/core/fileapi/FileReader.cpp b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
index 805822b5de986f891f76341a30fa185e542c4269..68f23f6463445b70277b1d4b24ea72bd6863d92d 100644
--- a/third_party/WebKit/Source/core/fileapi/FileReader.cpp
+++ b/third_party/WebKit/Source/core/fileapi/FileReader.cpp
@@ -135,7 +135,7 @@ class FileReader::ThrottlingController final
         m_runningReaders.size() < m_maxRunningReaders) {
       reader->executePendingRead();
       ASSERT(!m_runningReaders.contains(reader));
-      m_runningReaders.add(reader);
+      m_runningReaders.insert(reader);
       return;
     }
     m_pendingReaders.append(reader);
@@ -170,7 +170,7 @@ class FileReader::ThrottlingController final
         return;
       FileReader* reader = m_pendingReaders.takeFirst();
       reader->executePendingRead();
-      m_runningReaders.add(reader);
+      m_runningReaders.insert(reader);
     }
   }