Bug 1265796 - add .eslintrc to devtools/shared/platform/content/; r=gregtatum

devtools/shared/platform/content/ should never require chrome or a few
other things; enforce this with eslint.

MozReview-Commit-ID: DLgWITOvWeB

--HG--
extra : rebase_source : 3590da90f4796a03c8ab9c001f58d470ea2f5daa

devtools/shared/platform/content/.eslintrc

@@ -0,0 +1,9 @@
+{
+  // Extend from the devtools eslintrc.
+  "extends": "../../../.eslintrc",
+
+  "rules": {
+    // All code in this directory must be content-clean.
+    "mozilla/reject-some-requires": [2, "^(chrome|chrome:.*|resource:.*|devtools/server/.*|.*\\.jsm|devtools/shared/platform/(chome|content)/.*)$"],
+  },
+}