Remove unused editing related member functions from WebViewClient

LayoutTests/platform/win/editing/selection/5195166-2-expected.txt

Index: LayoutTests/platform/win/editing/selection/5195166-2-expected.txt
diff --git a/LayoutTests/platform/win/editing/selection/5195166-2-expected.txt b/LayoutTests/platform/win/editing/selection/5195166-2-expected.txt
index ced235dfb61051f9d58cb04559e279c08819655d..0341681f8a1506d5e4d4e255d14e4c6cc6421a24 100644
--- a/LayoutTests/platform/win/editing/selection/5195166-2-expected.txt
+++ b/LayoutTests/platform/win/editing/selection/5195166-2-expected.txt
@@ -1,13 +1,7 @@
-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: shouldChangeSelectedDOMRange:range from 0 of DIV > BODY > HTML > #document to 0 of DIV > BODY > HTML > #document toDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 1 of #text > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 1 of #text > DIV > BODY > HTML > #document toDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 2 of #text > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 2 of #text > DIV > BODY > HTML > #document toDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 3 of #text > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 3 of #text > DIV > BODY > HTML > #document toDOMRange:range from 0 of #text > DIV > BODY > HTML > #document to 2 of #text > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 layer at (0,0) size 800x600
   RenderView at (0,0) size 800x600