Remove old iossim code (pre-Xcode 8) and class-dump.

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 336 matching lines @@
      Var('chromium_git') + '/external/github.com/swisspol/GCDWebServer.git' + '@' + '3d5fd0b8281a7224c057deb2d17709b5bea64836',
 
     'src/ios/third_party/material_text_accessibility_ios/src':
      Var('chromium_git') + '/external/github.com/google/material-text-accessibility-ios.git' + '@' + '5a8cb31cf26d661f4b0f5fbcc9119cf3930ed098',
 
     'src/ios/third_party/ochamcrest/src':
      Var('chromium_git') + '/external/github.com/hamcrest/OCHamcrest.git' + '@' + 'd7ee4ecfb6bd13c3c8d364682b6228ccd86e1e1a',
 
     'src/third_party/google_toolbox_for_mac/src':
       Var('chromium_git') + '/external/github.com/google/google-toolbox-for-mac.git' + '@' + Var('google_toolbox_for_mac_revision'),
-
-    # class-dump utility to generate header files for undocumented SDKs
-    'src/third_party/class-dump/src':
-     Var('chromium_git') + '/external/github.com/nygard/class-dump.git' + '@' + '978d177ca6f0d2e5e34acf3e8dadc63e3140ebbc',
   },
   'mac': {
     'src/third_party/google_toolbox_for_mac/src':
       Var('chromium_git') + '/external/github.com/google/google-toolbox-for-mac.git' + '@' + Var('google_toolbox_for_mac_revision'),
 
 
     'src/third_party/lighttpd':
      Var('chromium_git') + '/chromium/deps/lighttpd.git' + '@' + Var('lighttpd_revision'),
 
     'src/chrome/installer/mac/third_party/xz/xz':
@@ skipping 639 matching lines @@
     ],
   },
 ]
 
 recursedeps = [
   # android_tools manages the NDK.
   'src/third_party/android_tools',
   # ANGLE manages DEPS that it also owns the build files for, such as dEQP.
   ("src/third_party/angle", "DEPS.chromium"),
 ]