Change DownloadProcessHandle to be more of an encapsulated class.

chrome/browser/download/download_create_info.cc

Index: chrome/browser/download/download_create_info.cc
diff --git a/chrome/browser/download/download_create_info.cc b/chrome/browser/download/download_create_info.cc
index 8a77e821c2bd337a02a306c00c9c0e0b06dd8677..5dd192b78ed806c1950a23e11cd416d969af993d 100644
--- a/chrome/browser/download/download_create_info.cc
+++ b/chrome/browser/download/download_create_info.cc
@@ -53,9 +53,7 @@ std::string DownloadCreateInfo::DebugString() const {
                             " path = \"%" PRFilePath "\""
                             " received_bytes = %" PRId64
                             " total_bytes = %" PRId64
-                            " child_id = %d"
-                            " render_view_id = %d"
-                            " request_id = %d"
+                            " request_handle = %s"
                             " prompt_user_for_save_location = %c"
                             " }",
                             download_id,
@@ -63,9 +61,7 @@ std::string DownloadCreateInfo::DebugString() const {
                             path.value().c_str(),
                             received_bytes,
                             total_bytes,
-                            process_handle.child_id(),
-                            process_handle.render_view_id(),
-                            process_handle.request_id(),
+                            request_handle.DebugString().c_str(),
                             prompt_user_for_save_location ? 'T' : 'F');
 }