Fix crash in AncestorThrottle that was causing a crash in telemetry perf unittests.

content/browser/frame_host/ancestor_throttle.cc

 // Copyright 2016 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 "content/browser/frame_host/ancestor_throttle.h"
 
 #include "base/metrics/histogram_macros.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
@@ skipping 154 matching lines @@
   return NavigationThrottle::BLOCK_RESPONSE;
 }
 
 AncestorThrottle::AncestorThrottle(NavigationHandle* handle)
     : NavigationThrottle(handle) {}
 
 void AncestorThrottle::ParseError(const std::string& value,
                                   HeaderDisposition disposition) {
   DCHECK(disposition == HeaderDisposition::CONFLICT ||
          disposition == HeaderDisposition::INVALID);
+  if (!navigation_handle()->GetRenderFrameHost())
+    return;  // Some responses won't have a RFH (i.e. 204/205s or downloads).
 
   std::string message;
   if (disposition == HeaderDisposition::CONFLICT) {
     message = base::StringPrintf(
         "Refused to display '%s' in a frame because it set multiple "
         "'X-Frame-Options' headers with conflicting values "
         "('%s'). Falling back to 'deny'.",
         navigation_handle()->GetURL().spec().c_str(), value.c_str());
   } else {
     message = base::StringPrintf(
         "Invalid 'X-Frame-Options' header encountered when loading '%s': "
         "'%s' is not a recognized directive. The header will be ignored.",
         navigation_handle()->GetURL().spec().c_str(), value.c_str());
   }
 
   // Log a console error in the parent of the current RenderFrameHost (as
   // the current RenderFrameHost itself doesn't yet have a document).
   navigation_handle()->GetRenderFrameHost()->GetParent()->AddMessageToConsole(
       CONSOLE_MESSAGE_LEVEL_ERROR, message);
 }
 
 void AncestorThrottle::ConsoleError(HeaderDisposition disposition) {
   DCHECK(disposition == HeaderDisposition::DENY ||
          disposition == HeaderDisposition::SAMEORIGIN);
+  if (!navigation_handle()->GetRenderFrameHost())
+    return;  // Some responses won't have a RFH (i.e. 204/205s or downloads).
+
   std::string message = base::StringPrintf(
       "Refused to display '%s' in a frame because it set 'X-Frame-Options' "
       "to '%s'.",
       navigation_handle()->GetURL().spec().c_str(),
       disposition == HeaderDisposition::DENY ? "deny" : "sameorigin");
 
   // Log a console error in the parent of the current RenderFrameHost (as
   // the current RenderFrameHost itself doesn't yet have a document).
   navigation_handle()->GetRenderFrameHost()->GetParent()->AddMessageToConsole(
       CONSOLE_MESSAGE_LEVEL_ERROR, message);
@@ skipping 46 matching lines @@
       HeadersContainFrameAncestorsCSP(headers)) {
     // TODO(mkwst): 'frame-ancestors' is currently handled in Blink. We should
     // handle it here instead. Until then, don't block the request, and let
     // Blink handle it. https://crbug.com/555418
     return HeaderDisposition::BYPASS;
   }
   return result;
 }
 
 }  // namespace content