Add ascii() / latin1() / utf8() methods to AtomicString to avoid having to call string()

Source/modules/mediasource/MediaSourceBase.cpp

Index: Source/modules/mediasource/MediaSourceBase.cpp
diff --git a/Source/modules/mediasource/MediaSourceBase.cpp b/Source/modules/mediasource/MediaSourceBase.cpp
index c2de62e52b1ec356cc2fc0f7cfb5081c2550f490..5df631de77d1a2ace91f14e049e146f43ba24cf9 100644
--- a/Source/modules/mediasource/MediaSourceBase.cpp
+++ b/Source/modules/mediasource/MediaSourceBase.cpp
@@ -171,7 +171,7 @@ void MediaSourceBase::setReadyState(const AtomicString& state)
     ASSERT(state == openKeyword() || state == closedKeyword() || state == endedKeyword());
 
     AtomicString oldState = readyState();
-    WTF_LOG(Media, "MediaSourceBase::setReadyState() %p : %s -> %s", this, oldState.string().ascii().data(), state.string().ascii().data());
+    WTF_LOG(Media, "MediaSourceBase::setReadyState() %p : %s -> %s", this, oldState.ascii().data(), state.ascii().data());
 
     if (state == closedKeyword()) {
         m_webMediaSource.clear();