Reland "[iOS] Remove all EG1 test targets and related GN components."

This is a reland of 6a309aadfb10b9dba95141c9007cf5baa89ef61b

Original change's description:
> [iOS] Remove all EG1 test targets and related GN components.
> 
> Removed all test targets, EG1 specific test utils in GN files.
> Removed gni files to build EG1 targets.
> Removed build files in ios/third_party/earl_grey.
> 
> Bug: 1046369
> Change-Id: Iec1d60fa40d10969c4e6e6840f2983b02c3170dc
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2275353
> Commit-Queue: Zhaoyang Li <[email protected]>
> Reviewed-by: Rohit Rao <[email protected]>
> Cr-Commit-Position: refs/heads/master@{#784204}

Bug: 1046369
Change-Id: I1690dcd79d4848cf042c06cfe2b479ed37b2df17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276682
Reviewed-by: Rohit Rao <[email protected]>
Commit-Queue: Rohit Rao <[email protected]>
Commit-Queue: Zhaoyang Li <[email protected]>
Cr-Commit-Position: refs/heads/master@{#784293}
73 files changed
tree: 2146a56aab30773f01262719b046b8429ee27a92
  1. android_webview/
  2. apps/
  3. ash/
  4. base/
  5. build/
  6. build_overrides/
  7. buildtools/
  8. cc/
  9. chrome/
  10. chromecast/
  11. chromeos/
  12. cloud_print/
  13. components/
  14. content/
  15. courgette/
  16. crypto/
  17. dbus/
  18. device/
  19. docs/
  20. extensions/
  21. fuchsia/
  22. gin/
  23. google_apis/
  24. google_update/
  25. gpu/
  26. headless/
  27. infra/
  28. ios/
  29. ipc/
  30. jingle/
  31. media/
  32. mojo/
  33. native_client_sdk/
  34. net/
  35. pdf/
  36. ppapi/
  37. printing/
  38. remoting/
  39. rlz/
  40. sandbox/
  41. services/
  42. skia/
  43. sql/
  44. storage/
  45. styleguide/
  46. testing/
  47. third_party/
  48. tools/
  49. ui/
  50. url/
  51. weblayer/
  52. .clang-format
  53. .clang-tidy
  54. .eslintrc.js
  55. .git-blame-ignore-revs
  56. .gitattributes
  57. .gitignore
  58. .gn
  59. .vpython
  60. .vpython3
  61. .yapfignore
  62. AUTHORS
  63. BUILD.gn
  64. CODE_OF_CONDUCT.md
  65. codereview.settings
  66. DEPS
  67. ENG_REVIEW_OWNERS
  68. LICENSE
  69. LICENSE.chromium_os
  70. OWNERS
  71. PRESUBMIT.py
  72. PRESUBMIT_test.py
  73. PRESUBMIT_test_mocks.py
  74. README.md
  75. WATCHLISTS
README.md

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