[Mac]: Make dictionary context menu item use system settings for whether to launch Dictionary.app o…

chrome/browser/ui/cocoa/tab_contents/render_view_context_menu_mac.mm

Index: chrome/browser/ui/cocoa/tab_contents/render_view_context_menu_mac.mm
===================================================================
--- chrome/browser/ui/cocoa/tab_contents/render_view_context_menu_mac.mm	(revision 150365)
+++ chrome/browser/ui/cocoa/tab_contents/render_view_context_menu_mac.mm	(working copy)
@@ -192,18 +192,9 @@
 }
 
 void RenderViewContextMenuMac::LookUpInDictionary() {
-  // TODO(morrita): On Safari, A dictionary panel could be shown
-  // based on a preference setting of Dictionary.app.  We currently
-  // don't support it: http://crbug.com/17951
-  NSString* text = base::SysUTF16ToNSString(params_.selection_text);
-  NSPasteboard* pboard = [NSPasteboard pasteboardWithUniqueName];
-  // 10.5 and earlier require declareTypes before setData.
-  // See the documentation on [NSPasteboard declareTypes].
-  NSArray* toDeclare = [NSArray arrayWithObject:NSStringPboardType];
-  [pboard declareTypes:toDeclare owner:nil];
-  BOOL ok = [pboard setString:text forType:NSStringPboardType];
-  if (ok)
-    NSPerformService(@"Look Up in Dictionary", pboard);
+  content::RenderWidgetHostView* view = GetRenderViewHost()->GetView();
+  if (view)
+    view->ShowDefinitionForSelection();
 }
 
 void RenderViewContextMenuMac::StartSpeaking() {