Clean up includes in testing/test_support.h

Change-Id: Id558c36d10501ce488717045bbf00bfed32e4b92
Reviewed-on: https://pdfium-review.googlesource.com/6870
Commit-Queue: dsinclair <dsinclair@chromium.org>
Reviewed-by: dsinclair <dsinclair@chromium.org>
diff --git a/testing/test_support.cpp b/testing/test_support.cpp
index 608e4ae..681a7ba 100644
--- a/testing/test_support.cpp
+++ b/testing/test_support.cpp
@@ -7,13 +7,13 @@
 #include <stdio.h>
 #include <string.h>
 
-#include <string>
-
+#include "core/fdrm/crypto/fx_crypt.h"
 #include "core/fxcrt/fx_memory.h"
 #include "testing/utils/path_service.h"
 
 #ifdef PDF_ENABLE_V8
 #include "v8/include/libplatform/libplatform.h"
+#include "v8/include/v8.h"
 #endif
 
 namespace {