Bookmark name inputs should only allow single-line input

chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm
index ebe06d174b66dc765c12669345f35f4b0a33984a..e18f7c0446aecc60980a8913d6f9b5bbc4ed5149 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_editor_controller.mm
@@ -9,6 +9,7 @@
 #include "chrome/browser/bookmarks/bookmark_expanded_state_tracker.h"
 #include "chrome/browser/bookmarks/bookmark_model.h"
 #include "chrome/browser/bookmarks/bookmark_utils.h"
+#import "chrome/browser/ui/cocoa/bookmarks/bookmark_cell_single_line.h"
 #include "ui/base/l10n/l10n_util.h"
 
 @interface BookmarkEditorController (Private)
@@ -48,6 +49,15 @@
 }
 
 - (void)awakeFromNib {
+  // Check if NSTextFieldCell supports the method. This check is in place as
+  // only 10.6 and greater support the setUsesSingleLineMode method.
+  // TODO(kushi.p): Remove this when the project hits a 10.6+ only state.
+  NSTextFieldCell* nameFieldCell_ = [nameTextField_ cell];
+  if ([nameFieldCell_
+          respondsToSelector:@selector(setUsesSingleLineMode:)]) {
+    [nameFieldCell_ setUsesSingleLineMode:YES];
+  }
+
   // Set text fields to match our bookmark.  If the node is NULL we
   // arrived here from an "Add Page..." item in a context menu.
   if (node_) {