Fix some gyp errors found with --check.

build/common.gypi

 # Copyright (c) 2010 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   'variables': {
     # .gyp files or targets should set chromium_code to 1 if they build
@@ skipping 526 matching lines @@
           },
         },
         'msvs_configuration_platform': 'Win32',
       },
       'x64_Base': {
         'abstract': 1,
         'msvs_configuration_platform': 'x64',
         'msvs_settings': {
           'VCLinkerTool': {
             'TargetMachine': '17', # x86 - 64
-          },
-        },
-        'msvs_settings': {
-          'VCLibrarianTool': {
             'AdditionalLibraryDirectories!':
               ['<(DEPTH)/third_party/platformsdk_win7/files/Lib'],
             'AdditionalLibraryDirectories':
               ['<(DEPTH)/third_party/platformsdk_win7/files/Lib/x64'],
           },
-          'VCLinkerTool': {
-            'TargetMachine': '17',
+          'VCLibrarianTool': {
             'AdditionalLibraryDirectories!':
               ['<(DEPTH)/third_party/platformsdk_win7/files/Lib'],
             'AdditionalLibraryDirectories':
               ['<(DEPTH)/third_party/platformsdk_win7/files/Lib/x64'],
           },
         },
         'defines': [
           # Not sure if tcmalloc works on 64-bit Windows.
           'NO_TCMALLOC',
         ],
@@ skipping 670 matching lines @@
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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