Enable PDF accessibility when RenderFrame's accessibility mode changes.

content/renderer/pepper/fake_pepper_plugin_instance.cc

Index: content/renderer/pepper/fake_pepper_plugin_instance.cc
diff --git a/content/renderer/pepper/fake_pepper_plugin_instance.cc b/content/renderer/pepper/fake_pepper_plugin_instance.cc
index e00c1eeed2fe88c738b971e2623c9594d0f8de16..0b6aff32c8d81c39aefe1cd492d9ce3a63b2cf95 100644
--- a/content/renderer/pepper/fake_pepper_plugin_instance.cc
+++ b/content/renderer/pepper/fake_pepper_plugin_instance.cc
@@ -11,15 +11,21 @@ namespace content {
 
 FakePepperPluginInstance::~FakePepperPluginInstance() {}
 
-content::RenderView* FakePepperPluginInstance::GetRenderView() { return NULL; }
+content::RenderFrame* FakePepperPluginInstance::GetRenderFrame() {
+  return nullptr;
+}
+
+content::RenderView* FakePepperPluginInstance::GetRenderView() {
+  return nullptr;
+}
 
 blink::WebPluginContainer* FakePepperPluginInstance::GetContainer() {
-  return NULL;
+  return nullptr;
 }
 
-v8::Isolate* FakePepperPluginInstance::GetIsolate() const { return NULL; }
+v8::Isolate* FakePepperPluginInstance::GetIsolate() const { return nullptr; }
 
-ppapi::VarTracker* FakePepperPluginInstance::GetVarTracker() { return NULL; }
+ppapi::VarTracker* FakePepperPluginInstance::GetVarTracker() { return nullptr; }
 
 const GURL& FakePepperPluginInstance::GetPluginURL() { return gurl_; }