Remove overeager DCHECK in SnapshotController.

components/offline_pages/snapshot_controller.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 "components/offline_pages/snapshot_controller.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 #include "base/time/time.h"
@@ skipping 27 matching lines @@
 
 void SnapshotController::Stop() {
   state_ = State::kStopped;
 }
 
 void SnapshotController::PendingSnapshotCompleted() {
   // Unless the controller is "stopped", enable the subsequent snapshots.
   // Stopped state prevents any further snapshots form being started.
   if (state_ == State::kStopped)
     return;
-  DCHECK(state_ == State::kSnapshotPending);
   state_ = State::kReady;
 }
 
 void SnapshotController::DocumentAvailableInMainFrame() {
   // Post a delayed task. The snapshot will happen either when the delay
   // is up, or if the "load" event is dispatched in the main frame.
   task_runner_->PostDelayedTask(
       FROM_HERE,
       base::Bind(&SnapshotController::MaybeStartSnapshot,
                  weak_ptr_factory_.GetWeakPtr()),
@@ skipping 13 matching lines @@
   state_ = State::kSnapshotPending;
   client_->StartSnapshot();
 }
 
 size_t SnapshotController::GetDelayAfterDocumentAvailableForTest() {
   return kDelayAfterDocumentAvailable;
 }
 
 
 }  // namespace offline_pages