2 files changed, 5 insertions, 4 deletions
diff --git a/core/fpdfdoc/cpdf_formfield.cpp b/core/fpdfdoc/cpdf_formfield.cpp
index a076b150a8..4cb9496af9 100644
--- a/core/fpdfdoc/cpdf_formfield.cpp
+++ b/core/fpdfdoc/cpdf_formfield.cpp
@@ -250,6 +250,10 @@ bool CPDF_FormField::ResetField(NotificationOption notify) {
   return true;
 }
 
+int CPDF_FormField::CountControls() const {
+  return pdfium::CollectionSize<int>(m_ControlList);
+}
+
 int CPDF_FormField::GetControlIndex(const CPDF_FormControl* pControl) const {
   if (!pControl)
     return -1;
diff --git a/core/fpdfdoc/cpdf_formfield.h b/core/fpdfdoc/cpdf_formfield.h
index a718cec29c..ce12169a71 100644
--- a/core/fpdfdoc/cpdf_formfield.h
+++ b/core/fpdfdoc/cpdf_formfield.h
@@ -15,7 +15,6 @@
 #include "core/fxcrt/fx_string.h"
 #include "core/fxcrt/fx_system.h"
 #include "core/fxcrt/unowned_ptr.h"
-#include "third_party/base/stl_util.h"
 
 class CPDF_Dictionary;
 class CPDF_Font;
@@ -110,9 +109,7 @@ class CPDF_FormField {
 
   bool ResetField(NotificationOption notify);
 
-  int CountControls() const {
-    return pdfium::CollectionSize<int>(m_ControlList);
-  }
+  int CountControls() const;
 
   CPDF_FormControl* GetControl(int index) const {
     return m_ControlList[index].Get();