Bug 1356931 - Remove gcc-b2g.manifest. r=sfink

The code that could make use of it was removed in bug 1239082.

--HG--
extra : rebase_source : 25f3aaf11ddbab333a60efe6236dc1458f181f10

js/src/devtools/rootAnalysis/build/gcc-b2g.manifest

@@ -1,11 +0,0 @@
-[
-  {
-    "version": "gcc 4.9.3",
-    "size": 102421980,
-    "visibility": "public",
-    "digest": "f25292aa93dc449e0472eee511c0ac15b5f1a4272ab76cf53ce5d20dc57f29e83da49ae1a9d9e994192647f75e13ae60f75ba2ac3cb9d26d5f5d6cabf88de921",
-    "algorithm": "sha512",
-    "filename": "gcc.tar.xz",
-    "unpack": true
-  }
-]

testing/mozharness/configs/hazards/common.py

@@ -45,7 +45,6 @@ config = {
     "virtualenv_path": '%s/venv' % os.getcwd(),
     'tools_dir': "/tools",
     'compiler_manifest': "build/gcc.manifest",
-    'b2g_compiler_manifest': "build/gcc-b2g.manifest",
     'sixgill_manifest': "build/sixgill.manifest",
 
     # Mock.