Remove the force_session cookie option, as it's not used anymore

chrome/browser/ui/cocoa/content_settings/cookie_details.mm

 // 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 "chrome/browser/ui/cocoa/content_settings/cookie_details.h"
 
 #import "base/i18n/time_formatting.h"
 #include "base/sys_string_conversions.h"
 #include "grit/generated_resources.h"
 #include "chrome/browser/cookies_tree_model.h"
@@ skipping 103 matching lines @@
     type_ = kCocoaCookieDetailsTypeFolder;
   }
   return self;
 }
 
 - (id)initWithCookie:(const net::CookieMonster::CanonicalCookie*)cookie
               origin:(NSString*)origin
    canEditExpiration:(BOOL)canEditExpiration {
   if ((self = [super init])) {
     type_ = kCocoaCookieDetailsTypeCookie;
-    hasExpiration_ = cookie->DoesExpire();
+    hasExpiration_ = cookie->IsPersistent();
     canEditExpiration_ = canEditExpiration && hasExpiration_;
     name_.reset([base::SysUTF8ToNSString(cookie->Name()) retain]);
     content_.reset([base::SysUTF8ToNSString(cookie->Value()) retain]);
     path_.reset([base::SysUTF8ToNSString(cookie->Path()) retain]);
     domain_.reset([origin retain]);
 
-    if (cookie->DoesExpire()) {
+    if (cookie->IsPersistent()) {
       expires_.reset([base::SysUTF16ToNSString(
           base::TimeFormatFriendlyDateAndTime(cookie->ExpiryDate())) retain]);
     } else {
       expires_.reset([l10n_util::GetNSStringWithFixup(
           IDS_COOKIES_COOKIE_EXPIRES_SESSION) retain]);
     }
 
     created_.reset([base::SysUTF16ToNSString(
         base::TimeFormatFriendlyDateAndTime(cookie->CreationDate())) retain]);
 
@@ skipping 151 matching lines @@
     details_.reset([details retain]);
   }
   return self;
 }
 
 - (CocoaCookieDetails*)details {
   return details_.get();
 }
 
 @end