Make CPDF_Parser::GetObjectTypeFromCrossRefStreamType() anonymous.

Move it into an anonymous namespace inside cpdf_parser.cpp, because that
is the necessary scope.

Change-Id: I7c5913e703c82ccf8fee72a8497be4c0a5d2b5fc
Reviewed-on: https://pdfium-review.googlesource.com/c/pdfium/+/86172
Commit-Queue: Lei Zhang <thestig@chromium.org>
Reviewed-by: Tom Sepez <tsepez@chromium.org>

core/fpdfapi/parser/cpdf_parser.cpp

diff --git a/core/fpdfapi/parser/cpdf_parser.cpp b/core/fpdfapi/parser/cpdf_parser.cpp
index 89505dc..2cf653a 100644
--- a/core/fpdfapi/parser/cpdf_parser.cpp
+++ b/core/fpdfapi/parser/cpdf_parser.cpp
@@ -55,6 +55,20 @@
   uint32_t obj_count;
 };
 
+CPDF_Parser::ObjectType GetObjectTypeFromCrossRefStreamType(
+    uint32_t cross_ref_stream_type) {
+  switch (cross_ref_stream_type) {
+    case 0:
+      return CPDF_Parser::ObjectType::kFree;
+    case 1:
+      return CPDF_Parser::ObjectType::kNotCompressed;
+    case 2:
+      return CPDF_Parser::ObjectType::kCompressed;
+    default:
+      return CPDF_Parser::ObjectType::kNull;
+  }
+}
+
 uint32_t GetVarInt(pdfium::span<const uint8_t> input) {
   uint32_t result = 0;
   for (uint8_t c : input)
@@ -1117,20 +1131,6 @@
   return SUCCESS;
 }
 
-CPDF_Parser::ObjectType CPDF_Parser::GetObjectTypeFromCrossRefStreamType(
-    uint32_t cross_ref_stream_type) const {
-  switch (cross_ref_stream_type) {
-    case 0:
-      return CPDF_Parser::ObjectType::kFree;
-    case 1:
-      return CPDF_Parser::ObjectType::kNotCompressed;
-    case 2:
-      return CPDF_Parser::ObjectType::kCompressed;
-    default:
-      return CPDF_Parser::ObjectType::kNull;
-  }
-}
-
 void CPDF_Parser::SetSyntaxParserForTesting(
     std::unique_ptr<CPDF_SyntaxParser> parser) {
   m_pSyntax = std::move(parser);

core/fpdfapi/parser/cpdf_parser.h

diff --git a/core/fpdfapi/parser/cpdf_parser.h b/core/fpdfapi/parser/cpdf_parser.h
index ba49609..aee0550 100644
--- a/core/fpdfapi/parser/cpdf_parser.h
+++ b/core/fpdfapi/parser/cpdf_parser.h
@@ -174,8 +174,6 @@
   bool ParseFileVersion();
 
   ObjectType GetObjectType(uint32_t objnum) const;
-  ObjectType GetObjectTypeFromCrossRefStreamType(
-      uint32_t cross_ref_stream_type) const;
 
   std::unique_ptr<CPDF_SyntaxParser> m_pSyntax;
   std::unique_ptr<ParsedObjectsHolder> m_pOwnedObjectsHolder;