Remove a useless CPDF_Document::GetRoot() call.

Change-Id: I175796fae412a2db028942c06ff2fa326b95a31b
Reviewed-on: https://pdfium-review.googlesource.com/c/48132
Reviewed-by: Henrique Nakashima <hnakashima@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>
diff --git a/fpdfsdk/fpdf_catalog_unittest.cpp b/fpdfsdk/fpdf_catalog_unittest.cpp
index c6ee790..daf7cd3 100644
--- a/fpdfsdk/fpdf_catalog_unittest.cpp
+++ b/fpdfsdk/fpdf_catalog_unittest.cpp
@@ -24,7 +24,6 @@
 
   void SetRoot(CPDF_Dictionary* root) {
     m_pRootDict = root;
-    GetRoot();
   }
 };