linux: drop NOTIMPLEMENTED in GotFocus()

chrome/browser/tab_contents/tab_contents_view_gtk.cc

Index: chrome/browser/tab_contents/tab_contents_view_gtk.cc
diff --git a/chrome/browser/tab_contents/tab_contents_view_gtk.cc b/chrome/browser/tab_contents/tab_contents_view_gtk.cc
index 892b67f322d41379dd734616b89f5fe7ff03b92c..72e7c1a2c05e00a9c54fc7da839c654d8234e7b1 100644
--- a/chrome/browser/tab_contents/tab_contents_view_gtk.cc
+++ b/chrome/browser/tab_contents/tab_contents_view_gtk.cc
@@ -548,7 +548,8 @@ void TabContentsViewGtk::UpdateDragCursor(WebDragOperation operation) {
 }
 
 void TabContentsViewGtk::GotFocus() {
-  NOTIMPLEMENTED();
+  // This is only used in the views FocusManager stuff but it bleeds through
+  // all subclasses.
 }
 
 // This is called when we the renderer asks us to take focus back (i.e., it has