Fix mojo build on android.

mojo/services/public/cpp/view_manager/tests/view_manager_unittest.cc

Index: mojo/services/public/cpp/view_manager/tests/view_manager_unittest.cc
diff --git a/mojo/services/public/cpp/view_manager/tests/view_manager_unittest.cc b/mojo/services/public/cpp/view_manager/tests/view_manager_unittest.cc
index d9e152ba2997e430f8d7ffd25b532a85086904e6..e1f19b11de7e9fab2c15ef98e8d9ae75af70e4e6 100644
--- a/mojo/services/public/cpp/view_manager/tests/view_manager_unittest.cc
+++ b/mojo/services/public/cpp/view_manager/tests/view_manager_unittest.cc
@@ -199,7 +199,7 @@ class DestructionObserver : public NodeObserver, public ViewObserver {
       NodeObserver::DispositionChangePhase phase) OVERRIDE {
     if (phase != NodeObserver::DISPOSITION_CHANGED)
       return;
-    std::set<Id>::const_iterator it = nodes_->find(node->id());
+    std::set<Id>::iterator it = nodes_->find(node->id());
     if (it != nodes_->end())
       nodes_->erase(it);
     if (CanQuit())
@@ -212,7 +212,7 @@ class DestructionObserver : public NodeObserver, public ViewObserver {
       ViewObserver::DispositionChangePhase phase) OVERRIDE {
     if (phase != ViewObserver::DISPOSITION_CHANGED)
       return;
-    std::set<Id>::const_iterator it = views_->find(view->id());
+    std::set<Id>::iterator it = views_->find(view->id());
     if (it != views_->end())
       views_->erase(it);
     if (CanQuit())