Cleanup: make CopyMetafileDataToReadOnlySharedMem anonymous

Routine isn't needed by platform implementations, so can be safely made
anonymous.

Simplification that came out of larger crrev.com/c/1616461.

Bug: 872935
Change-Id: I9a17edc72ad2222d31968e9bcaeebdb932eda4ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869375Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Alan Screen <awscreen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707840}

components/printing/renderer/print_render_frame_helper.cc

@@ -614,6 +614,26 @@ void RecordSiteIsolationPrintMetrics(blink::WebFrame* printed_frame) {
       cross_site_visible_frame_count);
 }
 
+bool CopyMetafileDataToReadOnlySharedMem(
+    const MetafileSkia& metafile,
+    PrintHostMsg_DidPrintContent_Params* params) {
+  uint32_t buf_size = metafile.GetDataSize();
+  if (buf_size == 0)
+    return false;
+
+  base::MappedReadOnlyRegion region_mapping =
+      mojo::CreateReadOnlySharedMemoryRegion(buf_size);
+  if (!region_mapping.IsValid())
+    return false;
+
+  if (!metafile.GetData(region_mapping.mapping.memory(), buf_size))
+    return false;
+
+  params->metafile_data_region = std::move(region_mapping.region);
+  params->subframe_content_info = metafile.GetSubframeContentInfo();
+  return true;
+}
+
 }  // namespace
 
 FrameReference::FrameReference(blink::WebLocalFrame* frame) {
@@ -2169,26 +2189,6 @@ void PrintRenderFrameHelper::PrintPageInternal(
 }
 #endif  // !defined(OS_MACOSX)
 
-bool PrintRenderFrameHelper::CopyMetafileDataToReadOnlySharedMem(
-    const MetafileSkia& metafile,
-    PrintHostMsg_DidPrintContent_Params* params) {
-  uint32_t buf_size = metafile.GetDataSize();
-  if (buf_size == 0)
-    return false;
-
-  base::MappedReadOnlyRegion region_mapping =
-      mojo::CreateReadOnlySharedMemoryRegion(buf_size);
-  if (!region_mapping.IsValid())
-    return false;
-
-  if (!metafile.GetData(region_mapping.mapping.memory(), buf_size))
-    return false;
-
-  params->metafile_data_region = std::move(region_mapping.region);
-  params->subframe_content_info = metafile.GetSubframeContentInfo();
-  return true;
-}
-
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 void PrintRenderFrameHelper::ShowScriptedPrintPreview() {
   if (is_scripted_preview_delayed_) {

components/printing/renderer/print_render_frame_helper.h

@@ -30,7 +30,6 @@
 struct PrintMsg_Print_Params;
 struct PrintMsg_PrintPages_Params;
 struct PrintMsg_PrintFrame_Params;
-struct PrintHostMsg_DidPrintContent_Params;
 struct PrintHostMsg_SetOptionsFromDocument_Params;
 
 // RenderViewTest-based tests crash on Android
@@ -340,10 +339,6 @@ class PrintRenderFrameHelper
 
   // Helper methods -----------------------------------------------------------
 
-  bool CopyMetafileDataToReadOnlySharedMem(
-      const MetafileSkia& metafile,
-      PrintHostMsg_DidPrintContent_Params* params);
-
   // Increments the IPC nesting level when an IPC message is received.
   void IPCReceived();