Update from https://crrev.com/303153

net/base/sdch_dictionary_fetcher.cc

Index: net/base/sdch_dictionary_fetcher.cc
diff --git a/net/base/sdch_dictionary_fetcher.cc b/net/base/sdch_dictionary_fetcher.cc
deleted file mode 100644
index 8d08b9a678afabacd828ee0b8efb70989362fabf..0000000000000000000000000000000000000000
--- a/net/base/sdch_dictionary_fetcher.cc
+++ /dev/null
@@ -1,244 +0,0 @@
-// Copyright 2014 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 "net/base/sdch_dictionary_fetcher.h"
-
-#include <stdint.h>
-
-#include "base/auto_reset.h"
-#include "base/bind.h"
-#include "base/compiler_specific.h"
-#include "base/thread_task_runner_handle.h"
-#include "net/base/load_flags.h"
-#include "net/url_request/url_request_context.h"
-#include "net/url_request/url_request_status.h"
-#include "net/url_request/url_request_throttler_manager.h"
-
-namespace {
-
-const int kBufferSize = 4096;
-
-}  // namespace
-
-namespace net {
-
-SdchDictionaryFetcher::SdchDictionaryFetcher(
-    SdchFetcher::Delegate* consumer,
-    URLRequestContext* context)
-    : next_state_(STATE_NONE),
-      in_loop_(false),
-      consumer_(consumer),
-      context_(context),
-      weak_factory_(this) {
-  DCHECK(CalledOnValidThread());
-  DCHECK(consumer);
-  DCHECK(context);
-}
-
-SdchDictionaryFetcher::~SdchDictionaryFetcher() {
-  DCHECK(CalledOnValidThread());
-}
-
-void SdchDictionaryFetcher::Schedule(const GURL& dictionary_url) {
-  DCHECK(CalledOnValidThread());
-
-  // Avoid pushing duplicate copy onto queue. We may fetch this url again later
-  // and get a different dictionary, but there is no reason to have it in the
-  // queue twice at one time.
-  if (!fetch_queue_.empty() && fetch_queue_.back() == dictionary_url) {
-    SdchManager::SdchErrorRecovery(
-        SdchManager::DICTIONARY_ALREADY_SCHEDULED_TO_DOWNLOAD);
-    return;
-  }
-  if (attempted_load_.find(dictionary_url) != attempted_load_.end()) {
-    SdchManager::SdchErrorRecovery(
-        SdchManager::DICTIONARY_ALREADY_TRIED_TO_DOWNLOAD);
-    return;
-  }
-  attempted_load_.insert(dictionary_url);
-  fetch_queue_.push(dictionary_url);
-
-  next_state_ = STATE_IDLE;
-
-  // There are no callbacks to user code from the dictionary fetcher,
-  // and Schedule() is only called from user code, so this call to DoLoop()
-  // does not require an |if (in_loop_) return;| guard.
-  DoLoop(OK);
-}
-
-void SdchDictionaryFetcher::Cancel() {
-  DCHECK(CalledOnValidThread());
-
-  next_state_ = STATE_NONE;
-
-  while (!fetch_queue_.empty())
-    fetch_queue_.pop();
-  attempted_load_.clear();
-  weak_factory_.InvalidateWeakPtrs();
-  current_request_.reset(NULL);
-  buffer_ = NULL;
-  dictionary_.clear();
-}
-
-void SdchDictionaryFetcher::OnResponseStarted(URLRequest* request) {
-  DCHECK(CalledOnValidThread());
-  DCHECK_EQ(request, current_request_.get());
-  DCHECK_EQ(next_state_, STATE_REQUEST_STARTED);
-
-  // The response has started, so the stream can be read from.
-  next_state_ = STATE_REQUEST_READING;
-
-  // If this function was synchronously called, the containing
-  // state machine loop will handle the state transition. Otherwise,
-  // restart the state machine loop.
-  if (in_loop_)
-    return;
-
-  DoLoop(request->status().error());
-}
-
-void SdchDictionaryFetcher::OnReadCompleted(URLRequest* request,
-                                            int bytes_read) {
-  DCHECK(CalledOnValidThread());
-  DCHECK_EQ(request, current_request_.get());
-  DCHECK_EQ(next_state_, STATE_REQUEST_READING);
-
-  // No state transition is required in this function; the
-  // completion of the request is detected in DoRead().
-
-  if (request->status().is_success())
-    dictionary_.append(buffer_->data(), bytes_read);
-
-  // If this function was synchronously called, the containing
-  // state machine loop will handle the state transition. Otherwise,
-  // restart the state machine loop.
-  if (in_loop_)
-    return;
-
-  DoLoop(request->status().error());
-}
-
-int SdchDictionaryFetcher::DoLoop(int rv) {
-  DCHECK(!in_loop_);
-  base::AutoReset<bool> auto_reset_in_loop(&in_loop_, true);
-
-  do {
-    State state = next_state_;
-    next_state_ = STATE_NONE;
-    switch (state) {
-      case STATE_IDLE:
-        rv = DoDispatchRequest(rv);
-        break;
-      case STATE_REQUEST_STARTED:
-        rv = DoRequestStarted(rv);
-        break;
-      case STATE_REQUEST_READING:
-        rv = DoRead(rv);
-        break;
-      case STATE_REQUEST_COMPLETE:
-        rv = DoCompleteRequest(rv);
-        break;
-      case STATE_NONE:
-        NOTREACHED();
-    }
-  } while (rv != ERR_IO_PENDING && next_state_ != STATE_NONE);
-
-  return rv;
-}
-
-int SdchDictionaryFetcher::DoDispatchRequest(int rv) {
-  DCHECK(CalledOnValidThread());
-
-  // |rv| is ignored, as the result from the previous request doesn't
-  // affect the next request.
-
-  if (fetch_queue_.empty() || current_request_.get()) {
-    next_state_ = STATE_NONE;
-    return OK;
-  }
-
-  current_request_ = context_->CreateRequest(
-      fetch_queue_.front(), IDLE, this, NULL);
-  current_request_->SetLoadFlags(LOAD_DO_NOT_SEND_COOKIES |
-                                 LOAD_DO_NOT_SAVE_COOKIES);
-  buffer_ = new IOBuffer(kBufferSize);
-  fetch_queue_.pop();
-
-  next_state_ = STATE_REQUEST_STARTED;
-  current_request_->Start();
-
-  return OK;
-}
-
-int SdchDictionaryFetcher::DoRequestStarted(int rv) {
-  DCHECK(CalledOnValidThread());
-  DCHECK_EQ(rv, OK);  // Can only come straight from above function.
-
-  // The transition to STATE_REQUEST_READING occurs in the
-  // OnResponseStarted() callback triggered by URLRequest::Start()
-  // (called in DoDispatchRequest(), above). If that callback did not
-  // occur synchronously, this routine is executed; it returns ERR_IO_PENDING,
-  // indicating to the controlling loop that no further work should be done
-  // until the callback occurs (which will re-invoke DoLoop()).
-  next_state_ = STATE_REQUEST_STARTED;
-  return ERR_IO_PENDING;
-}
-
-int SdchDictionaryFetcher::DoRead(int rv) {
-  DCHECK(CalledOnValidThread());
-
-  // If there's been an error, abort the current request.
-  if (rv != OK) {
-    current_request_.reset();
-    buffer_ = NULL;
-    next_state_ = STATE_IDLE;
-
-    return OK;
-  }
-
-  next_state_ = STATE_REQUEST_READING;
-  int bytes_read = 0;
-  if (!current_request_->Read(buffer_.get(), kBufferSize, &bytes_read)) {
-    if (current_request_->status().is_io_pending())
-      return ERR_IO_PENDING;
-
-    if (current_request_->status().error() == OK) {
-      // This "should never happen", but if it does the result will be
-      // an infinite loop.  It's not clear how to handle a read failure
-      // without a promise to invoke the callback at some point in the future,
-      // so the request is failed.
-      SdchManager::SdchErrorRecovery(SdchManager::DICTIONARY_FETCH_READ_FAILED);
-      DLOG(FATAL) <<
-          "URLRequest::Read() returned false without IO pending or error!";
-      return ERR_FAILED;
-    }
-
-    return current_request_->status().error();
-  }
-
-  if (bytes_read != 0)
-    dictionary_.append(buffer_->data(), bytes_read);
-  else
-    next_state_ = STATE_REQUEST_COMPLETE;
-
-  return OK;
-}
-
-int SdchDictionaryFetcher::DoCompleteRequest(int rv) {
-  DCHECK(CalledOnValidThread());
-
-  // If the dictionary was successfully fetched, add it to the manager.
-  if (rv == OK)
-    consumer_->AddSdchDictionary(dictionary_, current_request_->url());
-
-  current_request_.reset();
-  buffer_ = NULL;
-  dictionary_.clear();
-
-  next_state_ = STATE_IDLE;
-
-  return OK;
-}
-
-}  // namespace net