Remove webview-based behavior from --site-per-process flag.

content/browser/loader/resource_loader.cc

Index: content/browser/loader/resource_loader.cc
diff --git a/content/browser/loader/resource_loader.cc b/content/browser/loader/resource_loader.cc
index 0a7047d32b0f3365e13d716c167fc61aab7218d6..291bf84fd1b33241ae30a05575318188176efb8c 100644
--- a/content/browser/loader/resource_loader.cc
+++ b/content/browser/loader/resource_loader.cc
@@ -20,12 +20,10 @@
 #include "content/public/browser/cert_store.h"
 #include "content/public/browser/resource_context.h"
 #include "content/public/browser/resource_dispatcher_host_login_delegate.h"
-#include "content/public/browser/site_instance.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/process_type.h"
 #include "content/public/common/resource_response.h"
-#include "content/public/common/url_constants.h"
 #include "net/base/io_buffer.h"
 #include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
@@ -500,34 +498,6 @@ void ResourceLoader::CompleteResponseStarted() {
   scoped_refptr<ResourceResponse> response(new ResourceResponse());
   PopulateResourceResponse(request_.get(), response.get());
 
-  // The --site-per-process flag enables an out-of-process iframes
-  // prototype. It works by changing the MIME type of cross-site subframe
-  // responses to a Chrome specific one. This new type causes the subframe
-  // to be replaced by a <webview> tag with the same URL, which results in
-  // using a renderer in a different process.
-  //
-  // For prototyping purposes, we will use a small hack to ensure same site
-  // iframes are not changed. We can compare the URL for the subframe
-  // request with the referrer. If the two don't match, then it should be a
-  // cross-site iframe.
-  // Also, we don't do the MIME type change for chrome:// URLs, as those
-  // require different privileges and are not allowed in regular renderers.
-  //
-  // The usage of SiteInstance::IsSameWebSite is safe on the IO thread,
-  // if the browser_context parameter is NULL. This does not work for hosted
-  // apps, but should be fine for prototyping.
-  // TODO(nasko): Once the SiteInstance check is fixed, ensure we do the
-  // right thing here. http://crbug.com/160576
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
-  if (command_line.HasSwitch(switches::kSitePerProcess) &&
-      GetRequestInfo()->GetResourceType() == ResourceType::SUB_FRAME &&
-      response->head.mime_type == "text/html" &&
-      !request_->url().SchemeIs(chrome::kChromeUIScheme) &&
-      !SiteInstance::IsSameWebSite(NULL, request_->url(),
-                                   GURL(request_->referrer()))) {
-    response->head.mime_type = "application/browser-plugin";
-  }
-
   if (request_->ssl_info().cert.get()) {
     int cert_id = CertStore::GetInstance()->StoreCert(
         request_->ssl_info().cert.get(), info->GetChildID());