Remove now-unnecessary dbghelp.dll suitable for XP

base/base.isolate

 # Copyright 2014 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.
 {
   'includes': [
     # While the target 'base' doesn't depend on ../third_party/icu/icu.gyp
     # itself, virtually all targets using it has to include icu. The only
     # exception is the Windows sandbox (?).
     '../third_party/icu/icu.isolate',
     # Sanitizer-instrumented third-party libraries (if enabled).
     '../third_party/instrumented_libraries/instrumented_libraries.isolate',
     # MSVS runtime libraries.
     '../build/config/win/msvs_dependencies.isolate',
   ],
   'conditions': [
     ['use_custom_libcxx==1', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/lib/libc++.so',
         ],
       },
     }],
     ['OS=="mac" and asan==1', {
       'variables': {
         'files': [
           '<(PRODUCT_DIR)/libclang_rt.asan_osx_dynamic.dylib',
         ],
       },
     }],
-    ['OS=="win"', {
-      # Required for base/stack_trace_win.cc to symbolize correctly.
-      'variables': {
-        'files': [
-          '<(PRODUCT_DIR)/dbghelp.dll',
-        ],
-      },
-    }],
     ['OS=="win" and asan==1 and component=="shared_library"', {
       'variables': {
         'files': [
           # We only need x.y.z/lib/windows/clang_rt.asan_dynamic-i386.dll,
           # but since the version (x.y.z) changes, just grab the whole dir.
           '../third_party/llvm-build/Release+Asserts/lib/clang/',
         ],
       },
     }],
     ['OS=="linux" and (asan==1 or lsan==1 or msan==1 or tsan==1)', {
@@ skipping 11 matching lines @@
           '../third_party/llvm-build/Release+Asserts/bin/llvm-symbolizer<(EXECUTABLE_SUFFIX)',
         ],
       },
     }],
     # Workaround for https://code.google.com/p/swarming/issues/detail?id=211
     ['asan==0 or lsan==0 or msan==0 or tsan==0', {
       'variables': {},
     }],
   ],
 }