Move PopulateResourceRequestBody into anon namespc

Move PopulateResourceRequestBody() into the unnamed namespace because it
is only used in request_conversion.cc.

Change-Id: Ie23db3dceaa51e802cfa6f33553c4e059380edb5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2161875Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Wan-Teh Chang <wtc@google.com>
Cr-Commit-Position: refs/heads/master@{#761987}

third_party/blink/renderer/platform/loader/fetch/url_loader/request_conversion.cc

@@ -177,8 +177,6 @@ mojom::ResourceType RequestContextToResourceType(
   }
 }
 
-}  // namespace
-
 void PopulateResourceRequestBody(const EncodedFormData& src,
                                  network::ResourceRequestBody* dest) {
   for (const auto& element : src.Elements()) {
@@ -228,6 +226,8 @@ void PopulateResourceRequestBody(const EncodedFormData& src,
   }
 }
 
+}  // namespace
+
 void PopulateResourceRequest(const ResourceRequestHead& src,
                              ResourceRequestBody src_body,
                              network::ResourceRequest* dest) {

third_party/blink/renderer/platform/loader/fetch/url_loader/request_conversion.h

@@ -8,7 +8,6 @@
 // This file consists of request conversion functions between blink and network.
 
 namespace network {
-class ResourceRequestBody;
 struct ResourceRequest;
 }  // namespace network
 
@@ -16,10 +15,6 @@ namespace blink {
 
 class ResourceRequestHead;
 class ResourceRequestBody;
-class EncodedFormData;
-
-void PopulateResourceRequestBody(const EncodedFormData& src,
-                                 network::ResourceRequestBody* dest);
 
 void PopulateResourceRequest(const ResourceRequestHead& src,
                              ResourceRequestBody src_body,