Fix leaks in the embedder tests themselves.

fpdfsdk/src/fpdfview_embeddertest.cpp

 // Copyright 2015 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <limits>
 #include <string>
 
 #include "../../public/fpdfview.h"
 #include "../../testing/embedder_test.h"
 #include "fpdfview_c_api_test.h"
@@ skipping 176 matching lines @@
 }
 
 TEST_F(FPDFViewEmbeddertest, Crasher_451830) {
   EXPECT_TRUE(OpenDocument("testing/resources/bug_451830.pdf"));
 }
 
 TEST_F(FPDFViewEmbeddertest, Crasher_452455) {
   EXPECT_TRUE(OpenDocument("testing/resources/bug_452455.pdf"));
   FPDF_PAGE page = LoadPage(0);
   EXPECT_NE(nullptr, page);
+  UnloadPage(page);
 }
 
 TEST_F(FPDFViewEmbeddertest, Crasher3) {
   EXPECT_TRUE(OpenDocument("testing/resources/bug_454695.pdf"));
 }