Reduce image size to avoid out of memory

AV1FrameSizeTestsLarge.ValidSize test failed on x86-win32-gcc due to
running out of memory. This commit reduce the image size for the test
to avoid the failure.

Change-Id: Ie081878c7a57b9c453a25e990f446cc3f57704a4

test/frame_size_tests.cc

@@ -74,7 +74,7 @@ TEST_F(AV1FrameSizeTestsLarge, ValidSizes) {
 // In total the allocations will exceed 2GiB which may cause a failure with
 // mingw + wine, use a smaller size in that case.
 #if defined(_WIN32) && !defined(_WIN64) || defined(__OS2__)
-  video.SetSize(4096, 3072);
+  video.SetSize(2560, 1440);
 #else
   video.SetSize(4096, 4096);
 #endif