Make tab tooltip behavior consistent across all desktop platforms.

chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm

Index: chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
diff --git a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
index 4a01295c473c6d47b16e2e6e9beb07dd29bb074b..8be466b06fdd7abe970c2680ab5beb87fe8d01b0 100644
--- a/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
+++ b/chrome/browser/ui/cocoa/tabs/tab_strip_controller.mm
@@ -1223,8 +1223,6 @@ NSImage* Overlay(NSImage* ground, NSImage* overlay, CGFloat alpha) {
 // Handles setting the title of the tab based on the given |contents|. Uses
 // a canned string if |contents| is NULL.
 - (void)setTabTitle:(TabController*)tab withContents:(WebContents*)contents {
-  // TODO(miu): Rectify inconsistent tooltip behavior.  http://crbug.com/310947
-
   base::string16 title;
   if (contents)
     title = contents->GetTitle();