Revert of Add download_file_types.proto with ascii->binary conversion, as a resource.

chrome/browser/resources/safe_browsing/README.md

Index: chrome/browser/resources/safe_browsing/README.md
diff --git a/chrome/browser/resources/safe_browsing/README.md b/chrome/browser/resources/safe_browsing/README.md
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-# Behavior of Download File Types in Chrome
-
-This describes how to adjust file-type download behavior in
-Chrome including interactions with Safe Browsing.  The metadata described
-here, and stored in `download_file_types.asciipb`, will be both baked into
-Chrome released and pushable to Chrome between releases. http://crbug.com/596555
-
-Rendered version of this file: https://chromium.googlesource.com/chromium/src/+/master/chrome/browser/resources/safe_browsing/README.md
-
-
-## Procedure for adding a new type
-  * Edit `download_file_types.asciipb`. Update `histograms.xml`
-  * Get it reviewed, submit.
-  * Push via component update (PROCEDURE TBD)
-
-## Guidelines for a DownloadFileType entry:
-See `download_file_types.proto` for all fields.
-
-  * `extension`: Value must be unique within the config. It should be
-    lowercase ASCII and not contain a dot.  If there _is_ a duplicate,
-    first one wins.  Only the `default_file_type` should leave this unset.
-
-  * `uma_value`: Value must be unique and match one in the
-    `SBClientDownloadExtensions` enum in `histograms.xml`.
-
-  * `is_archive`: `True` if this filetype is a container for other files.
-     Leave it unset for `false`.
-
-  * `platform_settings`: (repeated) Must have one entry with an unset
-     `platform` field, and optionally additional entries with overrides
-     for one or more platforms.  An unset `platform` field acts as a
-     default for any platforms that don't have an override.  There should
-     not be two settings with the same `platform`, but if there are,
-     first one wins.  Keep them sorted by platform.
-
-  * `platform_settings.danger_level`: (required)
-    * `NOT_DANGEROUS`: Safe to download and open, even if the download
-       was accidental.
-    * `DANGEROUS`: Always warn the user that this file may harm their
-      computer.  We let them continue or discard the file.  If Safe
-      Browsing returns a SAFE verdict, we still warn the user.
-    * `ALLOW_ON_USER_GESTURE`: Warn the user normally but skip the warning
-      if there was a user gesture or the user visited this site before
-      midnight last night (i.e. is a repeat visit).  If Safe Browsing
-      returns a SAFE verdict for this file, it won't show a warning.
-
-  * `platform_settings.auto_open_hint`: Required.
-    * `ALLOW_AUTO_OPEN`: File type can be opened automatically if the user
-      selected that option from the download tray on a previous download
-      of this type.
-    * `DISALLOW_AUTO_OPEN`:  Never let the file automatically open.
-      Files that should be disallowed from auto-opening include those that
-      execute arbitrary or harmful code with user privileges, or change
-      configuration of the system to cause harmful behavior immediately
-      or at some time in the future. We *do* allow auto-open for files
-      that upon opening sufficiently warn the user about the fact that it
-      was downloaded from the internet and can do damage.  **Note**:
-      Some file types (e.g.: .local and .manifest) aren't dangerous
-      to open.  However, their presence on the file system may cause
-      potentially dangerous changes in behavior for other programs. We
-      allow automatically opening these file types, but always warn when
-      they are downloaded.
-
-  * `platform_settings.ping_setting`:  Required.  This controls what sort
-     of ping is sent to Safe Browsing and if a verdict is checked before
-     the user can access the file.
-    * `SAMPLED_PING`: Don't send a full Safe Browsing ping, but
-       send a no-PII "light-ping" for a random sample of SBER users.
-       This should be the default for unknown types.  The verdict won't
-       be used.
-    * `NO_PING`:  Don’t send any pings.  This file is whitelisted. All
-      NOT_DANGEROUS files should normally use this.
-    * `FULL_PING`: Send full pings and use the verdict. All dangerous
-      file should use this.
-
-  * TODO(nparker): Support this: `platform_settings.unpacker`:
-     optional. Specifies which archive unpacker internal to Chrome
-     should be used.  If potentially dangerous file types are found,
-     Chrome will send a full-ping for the entire file.  Otherwise, it'll
-     follow the ping settings. Can be one of UNPACKER_ZIP or UNPACKER_DMG.
-
-## Guidelines for the top level DownloadFileTypeConfig entry:
-  * `version_id`: Must be increased (+1) every time the file is checked in.
-     Will be logged to UMA.
-
-  * `sampled_ping_probability`: For what fraction of extended-reporting
-    users' downloads with unknown extensions (or
-    ping_setting=SAMPLED_PING) should we send light-pings? [0.0 .. 1.0]
-
-  * `file_type`: The big list of all known file types. Keep them
-     sorted by extension.
-
-  * `default_file_type`: Settings used if a downloaded file is not in
-    the above list.  `extension` is ignored, but other settings are used.
-    The ping_setting should be SAMPLED_PING for all platforms.
-