Updating R8 to remove class merging

Binary-Size: no longer class merging, this is expected
Bug: 908988
Change-Id: I4fd1c9ffde68a06cc0b38de613d53e554ea3cfea
Reviewed-on: https://chromium-review.googlesource.com/c/1409603
Commit-Queue: Sam Maier <smaier@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#625820}

DEPS

@@ -1109,7 +1109,7 @@ deps = {
       'packages': [
           {
               'package': 'chromium/third_party/r8',
-              'version': 'D9fqCyfGhC3zMZFOE-4gzA0yox519Qd-DRgqnkqJuqgC',
+              'version': 'SlcbUnEufAQ-iuOwGOl8yYQuctmpf7bMqh59kBfpil0C',
           },
       ],
       'condition': 'checkout_android',

third_party/r8/README.chromium

@@ -11,4 +11,6 @@ D8 is a dexer that converts java byte code to dex code. R8 is a proguard-like
 optimizer that also has the ability to dex. D8 is found within R8's repo.
 
 Local Modifications:
-None
+Turning off vertical and horizontal class merging, as described in
+https://issuetracker.google.com/122902374#comment11. We should no longer make
+this modification once the linked bug is fixed.