Rename all isolate_dependency_* to files.

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index d22afdb7ddb3aa419544cc1e4026654874f2a557..6e36b8a743b8c4b03f222f84767d61f74dcca920 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -920,13 +920,9 @@
         # dependencies verified. All the tests targets have the '_run' suffix,
         # e.g. base_unittests_run runs the target base_unittests. The test
         # target always calls tools/swarming_client/isolate.py. See the script's
-        # --help for more information and the valid --mode values. Meant to be
-        # overriden with GYP_DEFINES.
+        # --help for more information. Meant to be overriden with GYP_DEFINES.
         # TODO(maruel): Remove the conditions as more configurations are
         # supported.
-        # NOTE: The check for disable_nacl==0 and component=="static_library"
-        # can't be used here because these variables are not defined yet, but it
-        # is still not supported.
         ['OS!="ios" and OS!="android" and chromeos==0', {
           'test_isolation_mode%': 'check',
         }, {