Move unit tests to test/unittests.

build/all.gyp

 # Copyright 2011 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'dependencies': [
         '../samples/samples.gyp:*',
-        '../src/base/base.gyp:base-unittests',
-        '../src/compiler/compiler.gyp:compiler-unittests',
         '../src/d8.gyp:d8',
-        '../src/heap/heap.gyp:heap-unittests',
-        '../src/libplatform/libplatform.gyp:libplatform-unittests',
         '../test/cctest/cctest.gyp:*',
+        '../test/unittests/unittests.gyp:*',
       ],
       'conditions': [
         ['component!="shared_library"', {
           'dependencies': [
             '../tools/lexer-shell.gyp:lexer-shell',
             '../tools/lexer-shell.gyp:parser-shell',
           ],
         }],
       ]
     }
   ]
 }