Fix a crash occuring during the destruction of TextInputManager on Android.

content/browser/renderer_host/text_input_manager.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/text_input_manager.h"
 
 #include "base/strings/string16.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/view_messages.h"
@@ skipping 42 matching lines @@
   for (auto* view : views)
     Unregister(view);
 }
 
 RenderWidgetHostImpl* TextInputManager::GetActiveWidget() const {
   return !!active_view_ ? static_cast<RenderWidgetHostImpl*>(
                               active_view_->GetRenderWidgetHost())
                         : nullptr;
 }
 
-const TextInputState* TextInputManager::GetTextInputState(
-    RenderWidgetHostViewBase* view) const {
-  DCHECK(!view || IsRegistered(view));
-  if (!view)
-    view = active_view_;
-  return !!view ? &text_input_state_map_.at(view) : nullptr;
+const TextInputState* TextInputManager::GetTextInputState() const {
+  return !!active_view_ ? &text_input_state_map_.at(active_view_) : nullptr;
 }
 
 const TextInputManager::SelectionRegion* TextInputManager::GetSelectionRegion(
     RenderWidgetHostViewBase* view) const {
   DCHECK(!view || IsRegistered(view));
   if (!view)
     view = active_view_;
   return view ? &selection_region_map_.at(view) : nullptr;
 }
 
@@ skipping 269 matching lines @@
                     "point exceeds text length).";
     return false;
   }
 
   selected_text->clear();
   selected_text->append(text.substr(pos, n));
   return true;
 }
 
 }  // namespace content