Upgrade from Chromium 70.0.3538.4 to 70.0.3538.12

Fix #952

Author: bbondy

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "brave",
-  "version": "0.55.1",
+  "version": "0.55.2",
   "description": "Next generation Brave browser for macOS, Windows, Linux, and eventually Android",
   "scripts": {
     "cibuild": "node ./scripts/commands.js cibuild",
@@ -22,7 +22,7 @@
     "projects": {
       "chrome": {
         "dir": "src",
-        "tag": "70.0.3528.4",
+        "tag": "70.0.3538.12",
         "repository": {
           "url": "https://chromium.googlesource.com/chromium/src.git"
         },
@@ -38,7 +38,7 @@
       },
       "brave-core": {
         "dir": "src/brave",
-        "branch": "master",
+        "branch": "70.0.3538.6",
         "repository": {
           "url": "https://github.com/brave/brave-core.git"
         }