media/gpu/vaapi_unittest: move sandbox init to main()

crrev.com/c/2292813 (in 86.0.4202.0) removed one of the multiple calls
to VaapiWrapper::PreSandboxInitialization(), concretely the one in the
main() function, leaving only one in the test SetUp() method. This
broke the graphics.VAAPIUnittest.* in the CQ eve.

This CL fixes that by leaving a single call to said static method, in
the main() function.

Bug: 1105335, 1040291
Change-Id: I0b1bfa14f8768c6111697f591b0c8ff120c46e83
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298263
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Andres Calderon Jaramillo <andrescj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#788364}

media/gpu/vaapi/vaapi_unittest.cc

@@ -86,12 +86,6 @@ class VaapiTest : public testing::Test {
  public:
   VaapiTest() = default;
   ~VaapiTest() override = default;
-
-  void SetUp() override {
-    // PreSandboxInitialization() loads and opens the driver, queries its
-    // capabilities and fills in the VASupportedProfiles.
-    VaapiWrapper::PreSandboxInitialization();
-  }
 };
 
 std::map<VAProfile, std::vector<VAEntrypoint>> ParseVainfo(
@@ -234,6 +228,10 @@ TEST_F(VaapiTest, DefaultEntrypointIsSupported) {
 int main(int argc, char** argv) {
   base::TestSuite test_suite(argc, argv);
 
+  // PreSandboxInitialization() loads and opens the driver, queries its
+  // capabilities and fills in the VASupportedProfiles.
+  media::VaapiWrapper::PreSandboxInitialization();
+
   return base::LaunchUnitTests(
       argc, argv,
       base::BindOnce(&base::TestSuite::Run, base::Unretained(&test_suite)));