Fix loading PDFs with no HTTP response headers in OOP PDF

pdf/out_of_process_instance.cc

 // Copyright (c) 2012 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 "pdf/out_of_process_instance.h"
 
 #include <algorithm>  // for min/max()
 #define _USE_MATH_DEFINES  // for M_PI
 #include <cmath>      // for log() and pow()
 #include <math.h>
@@ skipping 298 matching lines @@
   const char* headers = NULL;
   for (uint32_t i = 0; i < argc; ++i) {
     if (strcmp(argn[i], "src") == 0)
       original_url = argv[i];
     else if (strcmp(argn[i], "stream-url") == 0)
       stream_url = argv[i];
     else if (strcmp(argn[i], "headers") == 0)
       headers = argv[i];
   }
 
+  // TODO(raymes): This is a hack to ensure that if no headers are passed in
+  // then we get the right MIME type. When the in process plugin is removed we
+  // can fix the document loader properly and remove this hack.
+  if (!headers || strcmp(headers, "") == 0)
+    headers = "content-type: application/pdf";
+
   if (!original_url)
     return false;
 
   if (!stream_url)
     stream_url = original_url;
 
   // If we're in print preview mode we don't need to load the document yet.
   // A |kJSResetPrintPreviewModeType| message will be sent to the plugin letting
   // it know the url to load. By not loading here we avoid loading the same
   // document twice.
@@ skipping 1054 matching lines @@
   LoadPreviewUrl(url);
 }
 
 void OutOfProcessInstance::UserMetricsRecordAction(
     const std::string& action) {
   // TODO(raymes): Move this function to PPB_UMA_Private.
   pp::PDF::UserMetricsRecordAction(this, pp::Var(action));
 }
 
 }  // namespace chrome_pdf