Remove default argument to CPDF_Dictionary::GetBooleanFor().

Change-Id: I5b64bc3af90b9557d8e0c456675afe60e463927d
Reviewed-on: https://pdfium-review.googlesource.com/c/43612
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
diff --git a/core/fpdfdoc/cpdf_iconfit.cpp b/core/fpdfdoc/cpdf_iconfit.cpp
index 5b3deee..bef9eb4 100644
--- a/core/fpdfdoc/cpdf_iconfit.cpp
+++ b/core/fpdfdoc/cpdf_iconfit.cpp
@@ -50,5 +50,5 @@
 }
 
 bool CPDF_IconFit::GetFittingBounds() {
-  return m_pDict ? m_pDict->GetBooleanFor("FB") : false;
+  return m_pDict && m_pDict->GetBooleanFor("FB", false);
 }