Remove the 2-level input method system & InputMethodBridge.

ui/base/ime/input_method_factory.cc

Index: ui/base/ime/input_method_factory.cc
diff --git a/ui/base/ime/input_method_factory.cc b/ui/base/ime/input_method_factory.cc
index 007608353fb88451386900e5c59709bdfe688abd..b4aa3cd9e4a3dc618d98f48bf6ebb225c25e06ba 100644
--- a/ui/base/ime/input_method_factory.cc
+++ b/ui/base/ime/input_method_factory.cc
@@ -23,6 +23,8 @@
 
 namespace {
 
+ui::InputMethod* g_input_method_for_testing = nullptr;
+
 bool g_input_method_set_for_testing = false;
 
 bool g_create_input_method_called = false;
@@ -37,6 +39,12 @@ scoped_ptr<InputMethod> CreateInputMethod(
   if (!g_create_input_method_called)
     g_create_input_method_called = true;
 
+  if (g_input_method_for_testing) {
+    ui::InputMethod* ret = g_input_method_for_testing;
+    g_input_method_for_testing = nullptr;
+    return make_scoped_ptr(ret);
+  }
+
   if (g_input_method_set_for_testing)
     return make_scoped_ptr(new MockInputMethod(delegate));
 
@@ -68,4 +76,8 @@ void SetUpInputMethodFactoryForTesting() {
   g_input_method_set_for_testing = true;
 }
 
+void SetUpInputMethodForTesting(InputMethod* input_method) {
+  g_input_method_for_testing = input_method;
+}
+
 }  // namespace ui