Add SwappedOut to TabContentsDelegate to allow us to correctly delete TabContents.

content/browser/tab_contents/tab_contents_delegate.cc

Index: content/browser/tab_contents/tab_contents_delegate.cc
diff --git a/content/browser/tab_contents/tab_contents_delegate.cc b/content/browser/tab_contents/tab_contents_delegate.cc
index 27b95aa20d156bbecae45beba3b533235d15725f..8a3b8887abbfa7b84df8d8478872136256736b15 100644
--- a/content/browser/tab_contents/tab_contents_delegate.cc
+++ b/content/browser/tab_contents/tab_contents_delegate.cc
@@ -62,6 +62,9 @@ void TabContentsDelegate::LoadProgressChanged(double progress) {
 void TabContentsDelegate::CloseContents(TabContents* source) {
 }
 
+void TabContentsDelegate::SwappedOut(TabContents* source) {
+}
+
 void TabContentsDelegate::MoveContents(TabContents* source,
                                        const gfx::Rect& pos) {
 }