[NTP Snippets] Fetcher: remove |overwrite| param

components/ntp_snippets/ntp_snippets_fetcher.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/ntp_snippets/ntp_snippets_fetcher.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/stringprintf.h"
@@ skipping 48 matching lines @@
 NTPSnippetsFetcher::~NTPSnippetsFetcher() {
   if (waiting_for_refresh_token_)
     token_service_->RemoveObserver(this);
 }
 
 scoped_ptr<NTPSnippetsFetcher::SnippetsAvailableCallbackList::Subscription>
 NTPSnippetsFetcher::AddCallback(const SnippetsAvailableCallback& callback) {
   return callback_list_.Add(callback);
 }
 
-void NTPSnippetsFetcher::FetchSnippets(bool overwrite) {
-  if (overwrite) {
-    StartFetch();
-  } else {
-    base::PostTaskAndReplyWithResult(
-        file_task_runner_.get(), FROM_HERE,
-        base::Bind(&base::PathExists, download_path_),
-        base::Bind(&NTPSnippetsFetcher::OnFileExistsCheckDone,
-                   weak_ptr_factory_.GetWeakPtr()));
-  }
-}
-
-void NTPSnippetsFetcher::OnFileExistsCheckDone(bool exists) {
-  if (exists) {
-    NotifyObservers();
-  } else {
-    StartFetch();
-  }
-}
-
-void NTPSnippetsFetcher::StartFetch() {
+void NTPSnippetsFetcher::FetchSnippets() {
   if (signin_manager_->IsAuthenticated()) {
     StartTokenRequest();
   } else {
     if (!waiting_for_refresh_token_) {
       // Wait until we get a refresh token.
       waiting_for_refresh_token_ = true;
       token_service_->AddObserver(this);
     }
   }
 }
 
 void NTPSnippetsFetcher::StartTokenRequest() {
   OAuth2TokenService::ScopeSet scopes;
   scopes.insert(kApiScope);
   oauth_request_ = token_service_->StartRequest(
       signin_manager_->GetAuthenticatedAccountId(), scopes, this);
 }
 
+void NTPSnippetsFetcher::OnFileMoveDone(bool success) {
+  if (!success) {
+    DLOG(WARNING) << "Could not move file to "
+                  << download_path_.LossyDisplayName();
+    return;
+  }
+
+  NotifyObservers();
+}
+
 void NTPSnippetsFetcher::NotifyObservers() {
   callback_list_.Notify(download_path_);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // OAuth2TokenService::Consumer overrides
 void NTPSnippetsFetcher::OnGetTokenSuccess(
     const OAuth2TokenService::Request* request,
     const std::string& access_token,
     const base::Time& expiration_time) {
@@ skipping 53 matching lines @@
   base::FilePath response_path;
   source->GetResponseAsFilePath(false, &response_path);
 
   base::PostTaskAndReplyWithResult(
       file_task_runner_.get(), FROM_HERE,
       base::Bind(&base::Move, response_path, download_path_),
       base::Bind(&NTPSnippetsFetcher::OnFileMoveDone,
                  weak_ptr_factory_.GetWeakPtr()));
 }
 
-void NTPSnippetsFetcher::OnFileMoveDone(bool success) {
-  if (!success) {
-    DLOG(WARNING) << "Could not move file to "
-                  << download_path_.LossyDisplayName();
-    return;
-  }
-
-  NotifyObservers();
-}
-
 }  // namespace ntp_snippets