Rewrite DocumentMarkerController to use SynchronousMutationObserver

third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.cpp b/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.cpp
index 074bb7a715aab966d6f61c8fa4bbe1f15bc7aa47..ec0cf2e61627f57be75a0802915bcc392dd29099 100644
--- a/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/DeleteSelectionCommand.cpp
@@ -750,9 +750,9 @@ void DeleteSelectionCommand::fixupWhitespace() {
     DCHECK(!textNode->layoutObject() ||
            textNode->layoutObject()->style()->collapseWhiteSpace())
         << textNode;
-    replaceTextInNodePreservingMarkers(
-        textNode, m_leadingWhitespace.computeOffsetInContainerNode(), 1,
-        nonBreakingSpaceString());
+    replaceTextInNode(textNode,
+                      m_leadingWhitespace.computeOffsetInContainerNode(), 1,
+                      nonBreakingSpaceString());
   }
   if (m_trailingWhitespace.isNotNull() &&
       !isRenderedCharacter(m_trailingWhitespace) &&
@@ -761,9 +761,9 @@ void DeleteSelectionCommand::fixupWhitespace() {
     DCHECK(!textNode->layoutObject() ||
            textNode->layoutObject()->style()->collapseWhiteSpace())
         << textNode;
-    replaceTextInNodePreservingMarkers(
-        textNode, m_trailingWhitespace.computeOffsetInContainerNode(), 1,
-        nonBreakingSpaceString());
+    replaceTextInNode(textNode,
+                      m_trailingWhitespace.computeOffsetInContainerNode(), 1,
+                      nonBreakingSpaceString());
   }
 }