Reset accessibility if it gets out of sync.

content/renderer/accessibility/renderer_accessibility_browsertest.cc

Index: content/renderer/accessibility/renderer_accessibility_browsertest.cc
diff --git a/content/renderer/accessibility/renderer_accessibility_browsertest.cc b/content/renderer/accessibility/renderer_accessibility_browsertest.cc
index a197b9f3e10b7f93ad35d35312ebbd5bb18f8fc1..af90ca4cc657bddb0b1f9d1087cbf55a2a9183d5 100644
--- a/content/renderer/accessibility/renderer_accessibility_browsertest.cc
+++ b/content/renderer/accessibility/renderer_accessibility_browsertest.cc
@@ -59,7 +59,7 @@ class RendererAccessibilityTest : public RenderViewTest {
     const IPC::Message* message =
         sink_->GetUniqueMessageMatching(AccessibilityHostMsg_Events::ID);
     ASSERT_TRUE(message);
-    Tuple1<std::vector<AccessibilityHostMsg_EventParams> > param;
+    Tuple2<std::vector<AccessibilityHostMsg_EventParams>, int> param;
     AccessibilityHostMsg_Events::Read(message, &param);
     ASSERT_GE(param.a.size(), 1U);
     *params = param.a[0];
@@ -550,7 +550,7 @@ TEST_F(RendererAccessibilityTest, EventOnObjectNotInTree) {
   const IPC::Message* message =
       sink_->GetUniqueMessageMatching(AccessibilityHostMsg_Events::ID);
   ASSERT_TRUE(message);
-  Tuple1<std::vector<AccessibilityHostMsg_EventParams> > param;
+  Tuple2<std::vector<AccessibilityHostMsg_EventParams>, int> param;
   AccessibilityHostMsg_Events::Read(message, &param);
   ASSERT_EQ(0U, param.a.size());
 }