Add flag to specify if explicitly requested download is from web.

chrome/browser/download/download_extension_api.cc

Index: chrome/browser/download/download_extension_api.cc
diff --git a/chrome/browser/download/download_extension_api.cc b/chrome/browser/download/download_extension_api.cc
index 48006b83ce1ae96bdbcd98f17722a4bffec249a1..dc90545fabe5736773120319daeeacbd6fef6e5e 100644
--- a/chrome/browser/download/download_extension_api.cc
+++ b/chrome/browser/download/download_extension_api.cc
@@ -503,6 +503,7 @@ void DownloadsDownloadFunction::BeginDownloadOnIOThread() {
 
   net::Error error = iodata_->rdh->BeginDownload(
       request.Pass(),
+      false,  // is_content_initiated

[benjhayden, 2012/05/14 13:51:51]

This |false| just means that downloads.download() will not be throttled, right?

[Randy Smith (Not in Mondays), 2012/05/14 15:55:28]

Yes, although I could imagine that we might add other meanings of "not
completely trusted" in the future.

       iodata_->resource_context,
       iodata_->render_process_host_id,
       iodata_->render_view_host_routing_id,