Invalidate the previous caret location when editing text nodes.

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

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index b340fa0da5aed82a7029cef51b3f70ad1ad0ca74..140eb8db74cf1550c6c2f2cddfd5af5296ca79ba 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -3929,6 +3929,12 @@ void Document::nodeWillBeRemoved(Node& n)
     }
 }
 
+void Document::dataWillChange(const CharacterData& characterData)
+{
+    if (LocalFrame* frame = this->frame())
+        frame->selection().dataWillChange(characterData);
+}
+
 void Document::didInsertText(Node* text, unsigned offset, unsigned length)
 {
     for (Range* range : m_ranges)