Bug 1734771 - part 7: Get rid of ContentEventHandler::GetNativeTextLengthBefore() due to unused r=m_kato

Differential Revision: https://phabricator.services.mozilla.com/D128144

Author: masayuki-nakano

dom/events/ContentEventHandler.cpp

@@ -583,17 +583,6 @@ uint32_t ContentEventHandler::GetNativeTextLength(const Text& aTextNode,
   return GetTextLength(aTextNode, LINE_BREAK_TYPE_NATIVE, aMaxLength);
 }
 
-/* static */
-uint32_t ContentEventHandler::GetNativeTextLengthBefore(nsIContent* aContent,
-                                                        nsINode* aRootNode) {
-  if (NS_WARN_IF(aContent->IsText())) {
-    return 0;
-  }
-  return ShouldBreakLineBefore(*aContent, aRootNode)
-             ? GetBRLength(LINE_BREAK_TYPE_NATIVE)
-             : 0;
-}
-
 /* static inline */
 uint32_t ContentEventHandler::GetBRLength(LineBreakType aLineBreakType) {
 #if defined(XP_WIN)

dom/events/ContentEventHandler.h

@@ -255,10 +255,6 @@ class MOZ_STACK_CLASS ContentEventHandler {
   // Get the native text length of aTextNode.
   static uint32_t GetNativeTextLength(const dom::Text& aTextNode,
                                       uint32_t aMaxLength = UINT32_MAX);
-  // Get the native text length which is inserted before aContent.
-  // aContent should be an element.
-  static uint32_t GetNativeTextLengthBefore(nsIContent* aContent,
-                                            nsINode* aRootNode);
 
  protected:
   // Get the text length of aTextNode.