Remove unused editing related member functions from WebViewClient

LayoutTests/platform/win/editing/undo/undo-delete-boundary-expected.txt

Index: LayoutTests/platform/win/editing/undo/undo-delete-boundary-expected.txt
diff --git a/LayoutTests/platform/win/editing/undo/undo-delete-boundary-expected.txt b/LayoutTests/platform/win/editing/undo/undo-delete-boundary-expected.txt
index 34623a2bac542ff3ad6bf686b2b5b17dce0e3e0c..52dc8243d3330596756cee9632d7997c639a1c88 100644
--- a/LayoutTests/platform/win/editing/undo/undo-delete-boundary-expected.txt
+++ b/LayoutTests/platform/win/editing/undo/undo-delete-boundary-expected.txt
@@ -1,26 +1,18 @@
-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 3 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldDeleteDOMRange:range from 1 of #text > B > SPAN > DIV > BODY > HTML > #document to 2 of #text > B > SPAN > DIV > BODY > HTML > #document
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldDeleteDOMRange:range from 0 of #text > B > SPAN > DIV > BODY > HTML > #document to 1 of #text > B > SPAN > DIV > BODY > HTML > #document
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 7 of #text > SPAN > DIV > BODY > HTML > #document to 7 of #text > SPAN > DIV > BODY > HTML > #document toDOMRange:range from 7 of #text > SPAN > DIV > BODY > HTML > #document to 7 of #text > SPAN > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldDeleteDOMRange:range from 6 of #text > SPAN > DIV > BODY > HTML > #document to 7 of #text > SPAN > DIV > BODY > HTML > #document
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldDeleteDOMRange:range from 5 of #text > SPAN > DIV > BODY > HTML > #document to 6 of #text > SPAN > DIV > BODY > HTML > #document
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 5 of #text > SPAN > DIV > BODY > HTML > #document to 5 of #text > SPAN > DIV > BODY > HTML > #document toDOMRange:range from 5 of #text > SPAN > DIV > BODY > HTML > #document to 2 of #text > B > SPAN > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
 layer at (0,0) size 800x600