Remove unused editing related member functions from WebViewClient

LayoutTests/platform/win/editing/execCommand/insertHorizontalRule-expected.txt

Index: LayoutTests/platform/win/editing/execCommand/insertHorizontalRule-expected.txt
diff --git a/LayoutTests/platform/win/editing/execCommand/insertHorizontalRule-expected.txt b/LayoutTests/platform/win/editing/execCommand/insertHorizontalRule-expected.txt
index 17d64ddd9a753adda995b011ba1e2a305df3cc31..d8e158bcc16d81695f35f25bf0b6a23f21fd001e 100644
--- a/LayoutTests/platform/win/editing/execCommand/insertHorizontalRule-expected.txt
+++ b/LayoutTests/platform/win/editing/execCommand/insertHorizontalRule-expected.txt
@@ -1,23 +1,15 @@
-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 1 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 0 of #text > DIV > BODY > HTML > #document toDOMRange:range from 2 of DIV > BODY > HTML > #document to 2 of DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldEndEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 3 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidEndEditing:WebViewDidEndEditingNotification
-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 1 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 0 of #text > DIV > BODY > HTML > #document toDOMRange:range from 2 of DIV > BODY > HTML > #document to 2 of DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
 layer at (0,0) size 800x600