Update from https://crrev.com/306655

gpu/config/gpu_info_collector_linux.cc

 // Copyright 2014 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 "gpu/config/gpu_info_collector_linux.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 13 matching lines @@
 #include "ui/gl/gl_switches.h"
 
 #if defined(USE_LIBPCI)
 #include "library_loaders/libpci.h"
 #endif
 
 namespace gpu {
 
 namespace {
 
+#if defined(USE_LIBPCI)
 // This checks if a system supports PCI bus.
 // We check the existence of /sys/bus/pci or /sys/bug/pci_express.
 bool IsPciSupported() {
   const base::FilePath pci_path("/sys/bus/pci/");
   const base::FilePath pcie_path("/sys/bus/pci_express/");
   return (base::PathExists(pci_path) ||
           base::PathExists(pcie_path));
 }
+#endif  // defined(USE_LIBPCI)
 
 // Scan /etc/ati/amdpcsdb.default for "ReleaseVersion".
 // Return empty string on failing.
 std::string CollectDriverVersionATI() {
   const base::FilePath::CharType kATIFileName[] =
       FILE_PATH_LITERAL("/etc/ati/amdpcsdb.default");
   base::FilePath ati_file_path(kATIFileName);
   if (!base::PathExists(ati_file_path))
     return std::string();
   std::string contents;
@@ skipping 210 matching lines @@
   gpu_info->driver_version = driver_version;
   return kCollectInfoSuccess;
 }
 
 void MergeGPUInfo(GPUInfo* basic_gpu_info,
                   const GPUInfo& context_gpu_info) {
   MergeGPUInfoGL(basic_gpu_info, context_gpu_info);
 }
 
 }  // namespace gpu