Backed out changeset e92048c87179 (bug 1302364) for failing test_emitter.py in e.g. spidermonkey tests. r=backout on a CLOSED TREE

python/mozbuild/mozbuild/testing.py

@@ -260,12 +260,10 @@ class TestResolver(MozbuildObject):
 # Keys are variable prefixes and values are tuples describing how these
 # manifests should be handled:
 #
-#    (flavor, install_root, install_subdir, package_tests)
+#    (flavor, install_prefix, package_tests)
 #
 # flavor identifies the flavor of this test.
-# install_root is the path prefix to install the files starting from the root
-#     directory and not as specified by the manifest location. (bug 972168)
-# install_subdir is the path of where to install the files in
+# install_prefix is the path prefix of where to install the files in
 #     the tests directory.
 # package_tests indicates whether to package test files into the test
 #     package; suites that compile the test files should not install