Fix site_instance DCHECK when loading restored tabs.

content/browser/android/content_view_core_impl.cc

 // Copyright (c) 2012 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/android/content_view_core_impl.h"
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
 #include "base/android/scoped_java_ref.h"
@@ skipping 852 matching lines @@
   web_contents_->GetController().GoToOffset(offset);
 }
 
 void ContentViewCoreImpl::StopLoading(JNIEnv* env, jobject obj) {
   web_contents_->Stop();
 }
 
 void ContentViewCoreImpl::Reload(JNIEnv* env, jobject obj) {
   // Set check_for_repost parameter to false as we have no repost confirmation
   // dialog ("confirm form resubmission" screen will still appear, however).
-  web_contents_->GetController().Reload(true);
+  if (web_contents_->GetController().NeedsReload())
+    web_contents_->GetController().LoadIfNecessary();
+  else
+    web_contents_->GetController().Reload(true);
   tab_crashed_ = false;
 }
 
 void ContentViewCoreImpl::CancelPendingReload(JNIEnv* env, jobject obj) {
   web_contents_->GetController().CancelPendingReload();
 }
 
 void ContentViewCoreImpl::ContinuePendingReload(JNIEnv* env, jobject obj) {
   web_contents_->GetController().ContinuePendingReload();
 }
@@ skipping 209 matching lines @@
   if (!HasField(env, clazz, "mNativeContentViewCore", "I")) {
     DLOG(ERROR) << "Unable to find ContentView.mNativeContentViewCore!";
     return false;
   }
   g_native_content_view = GetFieldID(env, clazz, "mNativeContentViewCore", "I");
 
   return RegisterNativesImpl(env) >= 0;
 }
 
 }  // namespace content