Remove 10.5 comment.

BUG=137676
TEST=


Review URL: https://chromiumcodereview.appspot.com/10827017

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150353 0039d316-1c4b-4281-b951-d872f2087c98

content/browser/renderer_host/render_widget_host_view_mac.mm

@@ -2951,8 +2951,6 @@ extern NSString *NSTextInputReplacementRangeAttributeName;
 }
 
 - (void)insertText:(id)string {
-  // This is a method on NSTextInput, not NSTextInputClient. But on 10.5, this
-  // gets called anyway. Forward to the right method. http://crbug.com/47890
   [self insertText:string replacementRange:NSMakeRange(NSNotFound, 0)];
 }