Fix BrowserAccessibilityManager valgrind errors.

chrome/browser/accessibility/browser_accessibility_manager_unittest.cc

Index: chrome/browser/accessibility/browser_accessibility_manager_unittest.cc
diff --git a/chrome/browser/accessibility/browser_accessibility_manager_unittest.cc b/chrome/browser/accessibility/browser_accessibility_manager_unittest.cc
index af984924ae1ae7788dedcd4cff948e0bc52f0255..3bbc2d353714da18c3fd48e2f05e5d0bf71433da 100644
--- a/chrome/browser/accessibility/browser_accessibility_manager_unittest.cc
+++ b/chrome/browser/accessibility/browser_accessibility_manager_unittest.cc
@@ -554,12 +554,12 @@ TEST(BrowserAccessibilityManagerTest, TestMoveChildUp) {
 
 TEST(BrowserAccessibilityManagerTest, TestCreateEmptyDocument) {
   // Try creating an empty document with busy state.
-  BrowserAccessibilityManager* manager =
-      BrowserAccessibilityManager::CreateEmptyDocument(
-          NULL,
-          WebAccessibility::STATE_BUSY,
-          NULL,
-          new CountedBrowserAccessibilityFactory());
+  scoped_ptr<BrowserAccessibilityManager> manager;
+  manager.reset(BrowserAccessibilityManager::CreateEmptyDocument(
+      NULL,
+      WebAccessibility::STATE_BUSY,
+      NULL,
+      new CountedBrowserAccessibilityFactory()));
 
   // Verify the root is as we expect by default.
   BrowserAccessibility* root = manager->GetRoot();
@@ -625,4 +625,8 @@ TEST(BrowserAccessibilityManagerTest, TestCreateEmptyDocument) {
 
   // Verify we don't reuse objects that have changed roles.
   EXPECT_NE(acc1_2, acc2_2);
+
+  // Ensure we properly cleaned up.
+  manager.reset();
+  ASSERT_EQ(0, CountedBrowserAccessibility::global_obj_count_);
 }