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This adds the chrome://safe-browsing/ WebUI page to WebView. This allows
WebView to hardcode URLs for testing Safe Browsing. This includes the
resources for the basic chrome://safe-browsing page.

As part of this, this adds WebUI to WebView for the first time.

This contains 2 changes to get things running for our tests:

 - Changes a DCHECK_EQ in content layer. This assumption doesn't
   hold for single process, so it crashes tests running in single
   process mode.
 - Adds more SandboxedProcessServices for the test shell. No change is
   needed for the actual WebView apk, because it already has more than
   enough SandboxedProcessServices (20).

The additional resources result in the following APK size increases for
the system_webview_google_apk target:

 - en-US.pak: 6896 -> 6947 (+51 bytes)
 - resources.pak: 434005 -> 436285 (+2280 bytes)

Bug: 709626
Test: run_webview_instrumentation_test_apk -f SafeBrowsingTest#testSafeBrowsingHardcodedUrls
Change-Id: Ie312521b323a5ba5ec37f8c44eaa1f0427587e34
Reviewed-on: https://chromium-review.googlesource.com/576404Reviewed-by: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Bo Liu <boliu@chromium.org>
Commit-Queue: Nate Fischer <ntfschr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488449}