Remove the 2-level input method system & InputMethodBridge.

ui/views/controls/prefix_selector_unittest.cc

Index: ui/views/controls/prefix_selector_unittest.cc
diff --git a/ui/views/controls/prefix_selector_unittest.cc b/ui/views/controls/prefix_selector_unittest.cc
index fe7614ba08aefdebe62b8d43e231f7f2cdec5027..fe2651cc7e20cb2ba8ef1b7d2ce6f4053ffa393c 100644
--- a/ui/views/controls/prefix_selector_unittest.cc
+++ b/ui/views/controls/prefix_selector_unittest.cc
@@ -46,6 +46,11 @@ class PrefixSelectorTest : public ViewsTestBase {
   PrefixSelectorTest() {
     selector_.reset(new PrefixSelector(&delegate_));
   }
+  ~PrefixSelectorTest() override {
+    // Explicitly release |selector_| here which can happen before releasing
+    // |delegate_|.
+    selector_.reset();
+  }
 
  protected:
   scoped_ptr<PrefixSelector> selector_;