Android: Roll R8 3.0.1-dev -> dfeb0e32

* Includes fix for L8 non-determinism
* Enables proto enum unboxing
* Includes fixes for tracereferences tool

Bug: 1142530
Change-Id: Ifd09646ac296f85ef1102ed69541d04dd64b141f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519098
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Mohamed Heikal <mheikal@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824404}

DEPS

@@ -1368,7 +1368,7 @@ deps = {
       'packages': [
           {
               'package': 'chromium/third_party/r8',
-              'version': 'cf9Zl4I4n6RqsJezIQ58bLhhVRdmCJ8Pvaemifu2QIIC',
+              'version': 'jIJhJ4I22Dx5V-URd7bp-x1RILv5vrLEJdjjt77MRPcC',
           },
       ],
       'condition': 'checkout_android',

third_party/r8/README.chromium

 Name: R8
 URL: https://r8.googlesource.com/r8
-Revision: 3a9986617a11797df59b5d9613d605661a733171
-Version: 3.0.1-dev
+Revision: dfeb0e3200aa737742fa1d72e64505c44b3a5f3c
+Version: Unknown
 License: BSD 3-Clause
 License File: NOT_SHIPPED
 Security Critical: no