Implement CrashReporterClient methods for Crashpad

This new implementation of GetProductNameAndVersion() will replace the
existing one in the transition to Crashpad.

GetSanitizationInformation() (for webview) will replace
GetCrashKeysWhitelist() and the SanitizationInfo struct passed during
crash reporter initialization.

These new methods are currently unused.

Bug: crashpad:30
Change-Id: Ic60d17cb3af8b4e7997009c23a44fcc8b94915a7
Reviewed-on: https://chromium-review.googlesource.com/1142511
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#578843}
12 files changed