Update chooser row view when mouse click down and move over rows

chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm

Index: chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm
diff --git a/chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm b/chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm
index 4b26f176e91e0326258a3ab1549fae6a2c2d221c..73f7caf2dfa8971c43f4e0e7e76d8437cbc77b7b 100644
--- a/chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm
+++ b/chrome/browser/ui/cocoa/extensions/chooser_dialog_cocoa_controller.mm
@@ -66,6 +66,12 @@ initWithChooserDialogCocoa:(ChooserDialogCocoa*)chooserDialogCocoa
   [connectButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
 }
 
+// Selection changes (while the mouse button is still down).
+- (void)tableViewSelectionIsChanging:(NSNotification*)aNotification {
+  [chooserContentView_ updateContentRowColor];
+  [connectButton_ setEnabled:[tableView_ numberOfSelectedRows] > 0];
+}
+
 - (void)onConnect:(id)sender {
   [chooserContentView_ accept];
   chooserDialogCocoa_->Dismissed();