Revert "FBTF: Move the TabRestoreService::Observer into its own file."

chrome/browser/sessions/session_backend.cc

 // Copyright (c) 2010 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 "chrome/browser/sessions/session_backend.h"
 
 #include <limits>
 
 #include "base/file_util.h"
 #include "base/histogram.h"
 #include "base/scoped_vector.h"
-#include "net/base/file_stream.h"
 
 using base::TimeTicks;
 
 // File version number.
 static const int32 kFileCurrentVersion = 1;
 
 // The signature at the beginning of the file = SSNS (Sessions).
 static const int32 kFileSignature = 0x53534E53;
 
 namespace {
@@ skipping 306 matching lines @@
                           content_size, NULL);
       if (wrote != content_size) {
         NOTREACHED() << "error writing";
         return false;
       }
     }
   }
   return true;
 }
 
-SessionBackend::~SessionBackend() {
-}
-
 void SessionBackend::ResetFile() {
   DCHECK(inited_);
   if (current_session_file_.get()) {
     // File is already open, truncate it. We truncate instead of closing and
     // reopening to avoid the possibility of scanners locking the file out
     // from under us once we close it. If truncation fails, we'll try to
     // recreate.
     if (current_session_file_->Truncate(sizeof_header()) != sizeof_header())
       current_session_file_.reset(NULL);
   }
@@ skipping 30 matching lines @@
 }
 
 FilePath SessionBackend::GetCurrentSessionPath() {
   FilePath path = path_to_dir_;
   if (type_ == BaseSessionService::TAB_RESTORE)
     path = path.AppendASCII(kCurrentTabSessionFileName);
   else
     path = path.AppendASCII(kCurrentSessionFileName);
   return path;
 }