Update the path of header file to avoid a compiling error in chrome

BUG=N/A
R=tsepez@chromium.org

Review URL: https://codereview.chromium.org/1059233005
diff --git a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
index 3999897..838c431 100644
--- a/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
+++ b/core/src/fpdfapi/fpdf_parser/fpdf_parser_parser_embeddertest.cpp
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "testing/embedder_test.h"
+#include "../../../testing/embedder_test.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 class FPDFParserEmbeddertest : public EmbedderTest {