Remove unused editing related member functions from WebViewClient

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

Index: LayoutTests/platform/win/editing/undo/undo-forward-delete-expected.txt
diff --git a/LayoutTests/platform/win/editing/undo/undo-forward-delete-expected.txt b/LayoutTests/platform/win/editing/undo/undo-forward-delete-expected.txt
index 92afeea906353d998550e4ff86426b014e1a7645..80e07852dfa9fcbbeb06f886ccc1949e984fd1e0 100644
--- a/LayoutTests/platform/win/editing/undo/undo-forward-delete-expected.txt
+++ b/LayoutTests/platform/win/editing/undo/undo-forward-delete-expected.txt
@@ -1,21 +1,14 @@
-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 5 of #text > SPAN > DIV > BODY > HTML > #document to 6 of #text > SPAN > DIV > BODY > HTML > #document
 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: 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: 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: 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 9 of #text > SPAN > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
 layer at (0,0) size 800x600