Reduce/remove usage of BrowserThread in content/browser/loader.

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 eafe82997771ac9c798d9e5676f69aaae2ce273d..d2a1bb1945d964138dc397963ac3b25c743c83b9 100644
--- a/content/browser/loader/resource_loader.cc
+++ b/content/browser/loader/resource_loader.cc
@@ -446,7 +446,7 @@ void ResourceLoader::OnReadCompleted(net::URLRequest* unused, int bytes_read) {
 
 void ResourceLoader::CancelSSLRequest(int error,
                                       const net::SSLInfo* ssl_info) {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(thread_checker_.CalledOnValidThread());
 
   // The request can be NULL if it was cancelled by the renderer (as the
   // request of the user navigating to a new page from the location bar).
@@ -462,7 +462,7 @@ void ResourceLoader::CancelSSLRequest(int error,
 }
 
 void ResourceLoader::ContinueSSLRequest() {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(thread_checker_.CalledOnValidThread());
 
   DVLOG(1) << "ContinueSSLRequest() url: " << request_->url().spec();