Conform to the unittest naming convention.

test/unittests/unittests.gyp

Index: test/unittests/unittests.gyp
diff --git a/test/unittests/unittests.gyp b/test/unittests/unittests.gyp
index 76248acc9455a03b4cb230badddd0e37dba7b027..34ab7d354c9b83ab749f986ab21912960e1f4d61 100644
--- a/test/unittests/unittests.gyp
+++ b/test/unittests/unittests.gyp
@@ -35,6 +35,7 @@
         'base/platform/time-unittest.cc',
         'base/sys-info-unittest.cc',
         'base/utils/random-number-generator-unittest.cc',
+        'char-predicates-unittest.cc',
         'compiler/change-lowering-unittest.cc',
         'compiler/common-operator-unittest.cc',
         'compiler/compiler-test-utils.h',
@@ -58,7 +59,6 @@
         'run-all-unittests.cc',
         'test-utils.h',
         'test-utils.cc',
-        'unicode/unicode-predicates-unittest.cc',
       ],
       'conditions': [
         ['v8_target_arch=="arm"', {