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This adds support in WebView for blocking Malicious Unwanted Software
(MUwS, UwS) AKA "Harmful software" via Safe Browsing.

In this CL, we do the following:

 * Add new strings for the quiet MUwS interstitial (which is only used
   by WebView). These strings live in assets/stored-locales/ in the APK.
 * Whitelist the quiet MUwS strings (from the previous bullet point) as
   well as the previously chrome-only loud MUwS strings. These strings
   move from assets/locales/ (compressed, chrome-only resources) to
   assets/stored-locales/ (uncompressed, chrome+webview resources) in
   the APK.
 * Change WebView's declared list of threats to include MUwS
 * Change testSafeBrowsingDoesNotBlockUnwantedSoftwarePages, since this
   assertion is no longer valid. Change this to ensure we *do* block
   MUwS pages
 * Add a new test to ensure we can show quiet interstitials for MUwS
 * Change SafeBrowsingQuietErrorUI to respond to MUwS, and refactor it
   to be more similar to the LoudErrorUI.

This change causes the following APK size changes (measurements taken
with is_official_build = true), after unzipping the APKs with `unzip -lv
$APK | grep 'pak'`.

Monochrome:
 * assets/locales/en-US.pak: 20068 -> 19926 (-142) (improvement)
 * assets/stored-locales/en-US.pak: 7773 -> 8472 (+669)
SystemWebViewGoogle:
 * assets/stored-locales/en-US.pak: 7773 -> 8472 (+669)

A later follow-up will add this page to chrome://interstitials.

Bug: 729268
Bug: 729271
Bug: 729272
Test: run_webview_instrumentation_test_apk -f SafeBrowsingTest#*
Test: Manual - load big and small interstitials, verify it looks correct
Change-Id: I79e81f48d8b2ceb1ddcad7fab2d3bed3fcb479ae
Reviewed-on: https://chromium-review.googlesource.com/1182945
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Tao Bai <michaelbai@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Nathan Parker <nparker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585268}