Remove unused editing related member functions from WebViewClient

LayoutTests/platform/mac/editing/pasteboard/subframe-dragndrop-1-expected.txt

Index: LayoutTests/platform/mac/editing/pasteboard/subframe-dragndrop-1-expected.txt
diff --git a/LayoutTests/platform/mac/editing/pasteboard/subframe-dragndrop-1-expected.txt b/LayoutTests/platform/mac/editing/pasteboard/subframe-dragndrop-1-expected.txt
index 8055dda51585f02ba0b60de4b19b593fe2736745..061bfcc5d1a440e6191075c0ff4df9991e7fe196 100644
--- a/LayoutTests/platform/mac/editing/pasteboard/subframe-dragndrop-1-expected.txt
+++ b/LayoutTests/platform/mac/editing/pasteboard/subframe-dragndrop-1-expected.txt
@@ -1,16 +1,9 @@
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 0 of BODY > HTML > #document to 0 of BODY > HTML > #document toDOMRange:range from 11 of #text > BODY > HTML > #document to 11 of #text > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of BODY > HTML > #document to 2 of BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 11 of #text > BODY > HTML > #document to 11 of #text > BODY > HTML > #document toDOMRange:range from 6 of #text > BODY > HTML > #document to 6 of #text > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 6 of #text > BODY > HTML > #document to 6 of #text > BODY > HTML > #document toDOMRange:range from 4 of #text > BODY > HTML > #document to 7 of #text > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldInsertNode:#document-fragment replacingDOMRange:range from 11 of #text > BODY > HTML > #document to 11 of #text > BODY > HTML > #document givenAction:WebViewInsertActionDropped
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 3 of #text > BODY > HTML > #document to 3 of #text > BODY > HTML > #document toDOMRange:range from 7 of #text > BODY > HTML > #document to 11 of #text > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
 layer at (0,0) size 800x600