Provide a way to disable libpci dependency.

gpu/config/gpu_info_collector_linux.cc

Index: gpu/config/gpu_info_collector_linux.cc
diff --git a/gpu/config/gpu_info_collector_linux.cc b/gpu/config/gpu_info_collector_linux.cc
index 9a21a2de09347b03b50b30c200447a61e8e39811..061fe35929e5acf5019dc2e5e6a0624332fadeed 100644
--- a/gpu/config/gpu_info_collector_linux.cc
+++ b/gpu/config/gpu_info_collector_linux.cc
@@ -17,13 +17,16 @@
 #include "base/strings/string_tokenizer.h"
 #include "base/strings/string_util.h"
 #include "gpu/config/gpu_info_collector.h"
-#include "library_loaders/libpci.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 #include "ui/gl/gl_implementation.h"
 #include "ui/gl/gl_surface.h"
 #include "ui/gl/gl_switches.h"
 
+#if defined(USE_LIBPCI)
+#include "library_loaders/libpci.h"
+#endif
+
 namespace gpu {
 
 namespace {
@@ -72,6 +75,10 @@ const uint32 kVendorIDAMD = 0x1002;
 CollectInfoResult CollectPCIVideoCardInfo(GPUInfo* gpu_info) {
   DCHECK(gpu_info);
 
+#if !defined(USE_LIBPCI)
+  return kCollectInfoNonFatalFailure;
+#else
+
   if (IsPciSupported() == false) {
     VLOG(1) << "PCI bus scanning is not supported";
     return kCollectInfoNonFatalFailure;
@@ -144,6 +151,7 @@ CollectInfoResult CollectPCIVideoCardInfo(GPUInfo* gpu_info) {
   if (!primary_gpu_identified)
     return kCollectInfoNonFatalFailure;
   return kCollectInfoSuccess;
+#endif
 }
 
 }  // namespace anonymous