Update parameter name in declaration to match definition.

CheckForUnsupportedAnnot was refactored in
https://pdfium-review.googlesource.com/c/pdfium/+/51230. This just
makes the parameter names match between declaration and definition
again to prevent google3 ClangTidy check from complaining.

Change-Id: I0ff7f29493ca748fa040fa34a30ccab42fc11c3d
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/51690
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Lei Zhang <thestig@chromium.org>

fpdfsdk/cpdfsdk_helpers.h

diff --git a/fpdfsdk/cpdfsdk_helpers.h b/fpdfsdk/cpdfsdk_helpers.h
index 25a1e78..038ee5d 100644
--- a/fpdfsdk/cpdfsdk_helpers.h
+++ b/fpdfsdk/cpdfsdk_helpers.h
@@ -263,7 +263,7 @@
                            IPDFSDK_PauseAdapter* pause);
 
 void ReportUnsupportedFeatures(CPDF_Document* pDoc);
-void CheckForUnsupportedAnnot(const CPDF_Annot* pPDFAnnot);
+void CheckForUnsupportedAnnot(const CPDF_Annot* pAnnot);
 
 #ifndef _WIN32
 void SetLastError(int err);