SafeBrowsing: Send FULL_PINGs for PDF downloads.

Bug: 927515
Change-Id: Id50577de69b38df4d99bec89228eb6e8f98cbed0
Reviewed-on: https://chromium-review.googlesource.com/c/1458919
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630074}

chrome/browser/resources/safe_browsing/download_file_types.asciipb

@@ -8,7 +8,7 @@
 ##
 ## Top level settings
 ##
-version_id: 29
+version_id: 30
 sampled_ping_probability: 0.01
 max_archived_binaries_to_report: 10
 default_file_type {
@@ -1377,7 +1377,7 @@ file_types {
 file_types {
   extension: "pdf"
   uma_value: 14
-  ping_setting: SAMPLED_PING
+  ping_setting: FULL_PING
 }
 file_types {
   extension: "pot"