Replace src/ios copy with DEPS mirror.

DEPS

 # This file contains dependencies for WebRTC.
 
 vars = {
   'chromium_git': 'https://chromium.googlesource.com',
   'chromium_revision': 'c755988946c0b539cc61cc55d38ae056e0356c27',
   'boringssl_git': 'https://boringssl.googlesource.com',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling swarming_client
   # and whatever else without interference from each other.
   'swarming_revision': 'ebc8dab6f8b8d79ec221c94de39a921145abd404',
@@ skipping 105 matching lines @@
       Var('chromium_git') + '/linux-syscall-support.git' + '@' + Var('lss_revision'),
     'src/third_party/mockito/src':
       Var('chromium_git') + '/external/mockito/mockito.git' + '@' + 'de83ad4598ad4cf5ea53c69a8a8053780b04b850',
     'src/third_party/requests/src':
       Var('chromium_git') + '/external/github.com/kennethreitz/requests.git' + '@' + 'f172b30356d821d180fa4ecfa3e71c7274a32de4',
     'src/third_party/robolectric/robolectric':
       Var('chromium_git') + '/external/robolectric.git' + '@' + 'e38b49a12fdfa17a94f0382cc8ffaf69132fd09b',
     'src/third_party/ub-uiautomator/lib':
       Var('chromium_git') + '/chromium/third_party/ub-uiautomator.git' + '@' + '00270549ce3161ae72ceb24712618ea28b4f9434',
   },
+  'ios': {
+    'src/ios':
+      Var('chromium_git') + '/chromium/src/ios' + '@' + '44a908d160175dd44c8a66c66d912066bcb364fd',
+  },
   'unix': {
     'src/third_party/lss':
       Var('chromium_git') + '/linux-syscall-support.git' + '@' + Var('lss_revision'),
   },
   'win': {
     # Dependencies used by libjpeg-turbo
     'src/third_party/yasm/binaries':
       Var('chromium_git') + '/chromium/deps/yasm/binaries.git' + '@' + '52f9b3f4b0aa06da24ef8b123058bb61ee468881',
 
     # WebRTC-only dependency (not present in Chromium).
@@ skipping 387 matching lines @@
   },
 ]
 
 recursedeps = [
   # buildtools provides clang_format, libc++, and libc++abi.
   'src/buildtools',
   # android_tools manages the NDK.
   'src/third_party/android_tools',
 ]