Extension Docs: Remove out dated version notes.

chrome/common/extensions/docs/static/xhr.html

Index: chrome/common/extensions/docs/static/xhr.html
diff --git a/chrome/common/extensions/docs/static/xhr.html b/chrome/common/extensions/docs/static/xhr.html
index bf020faacaac9427420bf8f65b296378e8513dfb..d19995f0d2f56701de1d12a38d93c48bfda9af8b 100644
--- a/chrome/common/extensions/docs/static/xhr.html
+++ b/chrome/common/extensions/docs/static/xhr.html
@@ -11,17 +11,6 @@ Extensions aren't so limited.
 An extension can talk to remote servers outside of its origin,
 as long as it first requests cross-origin permissions.</p>
 
-<p class="note">
-<b>Version note:</b>
-As of Chrome 13,
-content scripts can make cross-origin requests
-to the same servers as the rest of the extension.
-Before Chrome 13, a content script couldn't directly make requests;
-instead, it had to
-send a message to its parent extension
-asking the extension to make a cross-origin request.
-</p>
-
 <h2 id="extension-origin">Extension origin</h2>
 <p>Each running extension exists within its own separate security origin. Without
 requesting additional privileges, the extension can use