Fix GetAMDVideoCardInfo() linkage for Chrome non-Official builds.

gpu/config/gpu_info_collector_win.cc

Index: gpu/config/gpu_info_collector_win.cc
diff --git a/gpu/config/gpu_info_collector_win.cc b/gpu/config/gpu_info_collector_win.cc
index b339cd7c1d5f5678c44e40c1d2dd4c25e7824eb9..8968d41a2a7f3c9bb1148f670f2cce847af592ce 100644
--- a/gpu/config/gpu_info_collector_win.cc
+++ b/gpu/config/gpu_info_collector_win.cc
@@ -360,15 +360,15 @@ void CollectD3D11Support() {
 }
 }  // namespace anonymous
 
-#if !defined(GOOGLE_CHROME_BUILD)
+#if defined(GOOGLE_CHROME_BUILD) && defined(OFFICIAL_BUILD)
+// This function has a real implementation for official builds that can
+// be found in src/third_party/amd.
+void GetAMDVideocardInfo(GPUInfo* gpu_info);
+#else
 void GetAMDVideocardInfo(GPUInfo* gpu_info) {
   DCHECK(gpu_info);
   return;
 }
-#else
-// This function has a real implementation for official builds that can
-// be found in src/third_party/amd.
-void GetAMDVideocardInfo(GPUInfo* gpu_info);
 #endif
 
 bool CollectDriverInfoD3D(const std::wstring& device_id,