Remove unused editing related member functions from WebViewClient

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

Index: LayoutTests/platform/linux/editing/pasteboard/subframe-dragndrop-1-expected.txt
diff --git a/LayoutTests/platform/linux/editing/pasteboard/subframe-dragndrop-1-expected.txt b/LayoutTests/platform/linux/editing/pasteboard/subframe-dragndrop-1-expected.txt
index 91f61d415fbaf0bf88ec84727ca9915a481553ba..ba53abf0083f68d0e4b41897bec7cb8117d2f7fc 100644
--- a/LayoutTests/platform/linux/editing/pasteboard/subframe-dragndrop-1-expected.txt
+++ b/LayoutTests/platform/linux/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