mac: Fix BookmarkBarControllerTest.TestClearOnDealloc on Yosemite.

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

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm
index 688c7ba4a2a1c51417ae06340fdcc8538ea3ea07..09b85719f397440aa231bcc4c9173b771317987a 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller_unittest.mm
@@ -347,12 +347,17 @@ class BookmarkBarControllerTest : public BookmarkBarControllerTestBase {
     ASSERT_TRUE(browser());
     AddCommandLineSwitches();
 
-    bar_.reset(
-      [[BookmarkBarControllerNoOpen alloc]
+    // In OSX 10.10, the owner of a nib file is retain/autoreleased during the
+    // initialization of the nib. Wrapping the constructor in an
+    // autoreleasepool ensures that tests can control the destruction timing of
+    // |bar_|.
+    @autoreleasepool {
+      bar_.reset([[BookmarkBarControllerNoOpen alloc]
           initWithBrowser:browser()
              initialWidth:NSWidth([parent_view_ frame])
                  delegate:nil
            resizeDelegate:resizeDelegate_.get()]);
+    }
 
     InstallAndToggleBar(bar_.get());
   }