Remove memory_watcher tool as well as --memory-profile command line flag.

tools/memory_watcher/memory_watcher.gyp

-# Copyright (c) 2011 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.
-
-{
-  'variables': {
-    'chromium_code': 1,
-  },
-  'targets': [
-    {
-      'target_name': 'memory_watcher',
-      'type': 'shared_library',
-      'dependencies': [
-        '../../base/base.gyp:base',
-        '../../ui/gfx/gfx.gyp:gfx',
-        '../../ui/gfx/gfx.gyp:gfx_geometry',
-      ],
-      'defines': [
-        'BUILD_MEMORY_WATCHER',
-      ],
-      'include_dirs': [
-        '../..',
-      ],
-      # 4748 "/GS can not protect parameters and local variables from local
-      # buffer overrun because optimizations are disabled in function".
-      # 4740 "flow in or out of inline asm code suppresses global optimization"
-      # (result of __asm call x, __asm x:).
-      # Nothing to be done about these warnings.
-      'msvs_disabled_warnings': [ 4748, 4740 ],
-      'sources': [
-        'call_stack.cc',
-        'call_stack.h',
-        'dllmain.cc',
-        'hotkey.h',
-        'ia32_modrm_map.cc',
-        'ia32_opcode_map.cc',
-        'memory_hook.cc',
-        'memory_hook.h',
-        'memory_watcher.cc',
-        'memory_watcher.h',
-        'mini_disassembler.cc',
-        'preamble_patcher.cc',
-        'preamble_patcher.h',
-        'preamble_patcher_with_stub.cc',
-      ],
-    },
-  ],
-}