Fix typos in FPDFStructTreeEmbedderTest.

Does not compile with GCC.

Change-Id: Ie3e060483a69dff95b3dea836fc5b26d395ec668
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/72150
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/fpdf_structtree_embeddertest.cpp b/fpdfsdk/fpdf_structtree_embeddertest.cpp
index aff903a..f447fbb 100644
--- a/fpdfsdk/fpdf_structtree_embeddertest.cpp
+++ b/fpdfsdk/fpdf_structtree_embeddertest.cpp
@@ -87,7 +87,7 @@
     ASSERT_TRUE(struct_tree);
     ASSERT_EQ(1, FPDF_StructTree_CountChildren(struct_tree.get()));
 
-    FPDF_STRUCTELEMENT document = document =
+    FPDF_STRUCTELEMENT document =
         FPDF_StructTree_GetChildAtIndex(struct_tree.get(), 0);
     ASSERT_TRUE(document);
 
@@ -150,7 +150,7 @@
     ASSERT_TRUE(struct_tree);
     ASSERT_EQ(1, FPDF_StructTree_CountChildren(struct_tree.get()));
 
-    FPDF_STRUCTELEMENT document = document =
+    FPDF_STRUCTELEMENT document =
         FPDF_StructTree_GetChildAtIndex(struct_tree.get(), 0);
     ASSERT_TRUE(document);
 
@@ -195,7 +195,7 @@
     ASSERT_TRUE(struct_tree);
     ASSERT_EQ(1, FPDF_StructTree_CountChildren(struct_tree.get()));
 
-    FPDF_STRUCTELEMENT document = document =
+    FPDF_STRUCTELEMENT document =
         FPDF_StructTree_GetChildAtIndex(struct_tree.get(), 0);
     ASSERT_TRUE(document);