Enable GLX/EGL backend switching while run HW video decode with libva.

content/gpu/gpu_main.cc

Index: content/gpu/gpu_main.cc
diff --git a/content/gpu/gpu_main.cc b/content/gpu/gpu_main.cc
index c2ffd63470fbfda833198798b293c7f2a5e9272e..285be3ab008c3f3053de7ec4a650d35f2d07a9ee 100644
--- a/content/gpu/gpu_main.cc
+++ b/content/gpu/gpu_main.cc
@@ -42,7 +42,7 @@
 #include "sandbox/win/src/sandbox.h"
 #elif defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL) && defined(USE_X11)
 #include "content/common/gpu/media/exynos_video_decode_accelerator.h"
-#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
+#elif defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
 #include "content/common/gpu/media/vaapi_wrapper.h"
 #endif
 
@@ -360,7 +360,8 @@ bool WarmUpSandbox(const CommandLine& command_line) {
 
 #if defined(OS_CHROMEOS) && defined(ARCH_CPU_ARMEL) && defined(USE_X11)
   ExynosVideoDecodeAccelerator::PreSandboxInitialization();
-#elif defined(OS_CHROMEOS) && defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
+#elif !defined(OS_ANDROID) && !defined(OS_MACOSX) && !defined(OS_WIN) && \
+    defined(ARCH_CPU_X86_FAMILY) && defined(USE_X11)
   VaapiWrapper::PreSandboxInitialization();
 #endif