Make no-location redirect response to be "opaque redirect" when redirect mode is manual.

third_party/WebKit/Source/modules/fetch/FetchManager.cpp

Index: third_party/WebKit/Source/modules/fetch/FetchManager.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
index 37ad99a8621ae4bf4cc5cddb74b97db9a3f11748..3d755b6efc711659a3d9cd28a788c5758945aa71 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
+++ b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
@@ -448,26 +448,14 @@ void FetchManager::Loader::didReceiveResponse(
 
   FetchResponseData* taintedResponse = nullptr;
 
-  if (NetworkUtils::isRedirectResponseCode(m_responseHttpStatusCode)) {
-    Vector<String> locations;
-    responseData->headerList()->getAll(HTTPNames::Location, locations);
-    if (locations.size() > 1) {
-      performNetworkError("Multiple Location header.");
-      return;
-    }
-    if (locations.size() == 1) {
-      KURL locationURL(m_request->url(), locations[0]);
-      if (!locationURL.isValid()) {
-        performNetworkError("Invalid Location header.");
-        return;
-      }
-      ASSERT(m_request->redirect() == WebURLRequest::FetchRedirectModeManual);
-      taintedResponse = responseData->createOpaqueRedirectFilteredResponse();
-    }
-    // When the location header doesn't exist, we don't treat the response
-    // as a redirect response, and execute tainting.
-  }
-  if (!taintedResponse) {
+  DCHECK(!(NetworkUtils::isRedirectResponseCode(m_responseHttpStatusCode) &&
+           responseData->headerList()->has(HTTPNames::Location) &&
+           m_request->redirect() != WebURLRequest::FetchRedirectModeManual));
+
+  if (NetworkUtils::isRedirectResponseCode(m_responseHttpStatusCode) &&
+      m_request->redirect() == WebURLRequest::FetchRedirectModeManual) {
+    taintedResponse = responseData->createOpaqueRedirectFilteredResponse();
+  } else {
     switch (tainting) {
       case FetchRequestData::BasicTainting:
         taintedResponse = responseData->createBasicFilteredResponse();