Remove OneClickSigninHelper since it is no longer used.

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index b46b3f78fe9c1be4996c2cad896ccb873206237a..3d859531b77ffd15016748238c789338f30eda26 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -79,10 +79,6 @@
 #include "chrome/browser/supervised_user/supervised_user_resource_throttle.h"
 #endif
 
-#if defined(ENABLE_ONE_CLICK_SIGNIN)
-#include "chrome/browser/ui/sync/one_click_signin_helper.h"
-#endif
-
 #if defined(USE_SYSTEM_PROTOBUF)
 #include <google/protobuf/repeated_field.h>
 #else
@@ -439,10 +435,6 @@ void ChromeResourceDispatcherHostDelegate::RequestBeginning(
     request->SetExtraRequestHeaders(headers);
   }
 
-#if defined(ENABLE_ONE_CLICK_SIGNIN)
-  AppendChromeSyncGaiaHeader(request, resource_context);
-#endif
-
 #if defined(ENABLE_CONFIGURATION_POLICY)
   if (io_data->policy_header_helper())
     io_data->policy_header_helper()->AddPolicyHeaders(request->url(), request);
@@ -593,28 +585,6 @@ void ChromeResourceDispatcherHostDelegate::AppendStandardResourceThrottles(
   }
 }
 
-#if defined(ENABLE_ONE_CLICK_SIGNIN)
-void ChromeResourceDispatcherHostDelegate::AppendChromeSyncGaiaHeader(
-    net::URLRequest* request,
-    content::ResourceContext* resource_context) {
-  static const char kAllowChromeSignIn[] = "Allow-Chrome-SignIn";
-
-  ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);
-  OneClickSigninHelper::Offer offer =
-      OneClickSigninHelper::CanOfferOnIOThread(request, io_data);
-  switch (offer) {
-    case OneClickSigninHelper::CAN_OFFER:
-      request->SetExtraRequestHeaderByName(kAllowChromeSignIn, "1", false);
-      break;
-    case OneClickSigninHelper::DONT_OFFER:
-      request->RemoveRequestHeaderByName(kAllowChromeSignIn);
-      break;
-    case OneClickSigninHelper::IGNORE_REQUEST:
-      break;
-  }
-}
-#endif
-
 bool ChromeResourceDispatcherHostDelegate::ShouldForceDownloadResource(
     const GURL& url, const std::string& mime_type) {
 #if defined(ENABLE_EXTENSIONS)
@@ -703,15 +673,6 @@ void ChromeResourceDispatcherHostDelegate::OnResponseStarted(
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
   ProfileIOData* io_data = ProfileIOData::FromResourceContext(resource_context);
 
-#if defined(ENABLE_ONE_CLICK_SIGNIN)
-  // See if the response contains the Google-Accounts-SignIn header.  If so,
-  // then the user has just finished signing in, and the server is allowing the
-  // browser to suggest connecting the user's profile to the account.
-  OneClickSigninHelper::ShowInfoBarIfPossible(request, io_data,
-                                              info->GetChildID(),
-                                              info->GetRouteID());
-#endif
-
   // See if the response contains the X-Chrome-Manage-Accounts header. If so
   // show the profile avatar bubble so that user can complete signin/out action
   // the native UI.
@@ -761,16 +722,6 @@ void ChromeResourceDispatcherHostDelegate::OnRequestRedirected(
 
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
 
-#if defined(ENABLE_ONE_CLICK_SIGNIN)
-  // See if the response contains the Google-Accounts-SignIn header.  If so,
-  // then the user has just finished signing in, and the server is allowing the
-  // browser to suggest connecting the user's profile to the account.
-  OneClickSigninHelper::ShowInfoBarIfPossible(request, io_data,
-                                              info->GetChildID(),
-                                              info->GetRouteID());
-  AppendChromeSyncGaiaHeader(request, resource_context);
-#endif
-
   // In the Mirror world, Chrome should append a X-Chrome-Connected header to
   // all Gaia requests from a connected profile so Gaia could return a 204
   // response and let Chrome handle the action with native UI. The only