Refactor DocumentMarkerController to use SynchronousMutationObserver

third_party/WebKit/Source/core/dom/CharacterData.cpp

Index: third_party/WebKit/Source/core/dom/CharacterData.cpp
diff --git a/third_party/WebKit/Source/core/dom/CharacterData.cpp b/third_party/WebKit/Source/core/dom/CharacterData.cpp
index 9af75b3df04e5c61f426f8d53390a89c290d4fa5..da4c59b408449f3a68fca70fd9c9cc8cd91577a8 100644
--- a/third_party/WebKit/Source/core/dom/CharacterData.cpp
+++ b/third_party/WebKit/Source/core/dom/CharacterData.cpp
@@ -151,7 +151,7 @@ void CharacterData::replaceData(unsigned offset,
   setDataAndUpdate(newStr, offset, realCount, data.length(),
                    UpdateFromNonParser);
 
-  // update the markers for spell checking and grammar checking
+  // update DOM ranges
   document().didRemoveText(this, offset, realCount);
   document().didInsertText(this, offset, data.length());
 }