Revert of Add //components/signin/ios/browser:unit_tests to components_unittests.

Revert of Add //components/signin/ios/browser:unit_tests to components_unittests. (patchset #2 id:20001 of https://codereview.chromium.org/1441353003/ )

Reason for revert:
This patch set very likely broke all the tab_capture_end2end_tests on Mac.

I am reverting this AND the change the sheriff made (which disabled the failing tests): https://codereview.chromium.org/1456863003/

See http://crbug.com/557929 for more details.

Original issue's description:
> Add //components/signin/ios/browser:unit_tests to components_unittests.
> 
> Fix an incorrect dependency in the BUILD.gn file and add deps to
> the targets in //components/BUILD.gn.
> 
> Add a reference to gn target in //components/sessions.gypi.
> 
> BUG=459705
> 
> Committed: https://crrev.com/06332e60d4928fee0cfa695cd55b3eab8f31a26a
> Cr-Commit-Position: refs/heads/master@{#360320}

TBR=dpranke@chromium.org,sdefresne@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=459705

[miu, 2015-11-19 02:50:47]

Created Revert of Add //components/signin/ios/browser:unit_tests to
components_unittests.

[miu, 2015-11-19 02:50:54]

The CQ bit was checked by miu@chromium.org

[commit-bot: I haz the power, 2015-11-19 02:51:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1458603009/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1458603009/1

[commit-bot: I haz the power, 2015-11-19 02:52:26]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-11-19 02:52:26]

Failed to apply patch for components/BUILD.gn:
While running git apply --index -3 -p1;
  error: patch failed: components/BUILD.gn:53
  Falling back to three-way merge...
  Applied patch to 'components/BUILD.gn' with conflicts.
  U components/BUILD.gn

Patch:       components/BUILD.gn
Index: components/BUILD.gn
diff --git a/components/BUILD.gn b/components/BUILD.gn
index
505988d5b16859b4ed9f6ab2fdd5a4c836df541e..e4e2c61855327befc20f5c0111686ae6a7b8e04c
100644
--- a/components/BUILD.gn
+++ b/components/BUILD.gn
@@ -53,7 +53,6 @@
     "//components/pref_registry",
     "//components/omnibox/browser",
     "//components/infobars/core",
-    "//components/signin/core/browser",
     "//components/translate/core/browser",
     "//components/translate/core/common",
     "//components/version_ui",
@@ -134,6 +133,7 @@
       "//components/safe_browsing_db",
       "//components/search_provider_logos",
       "//components/security_interstitials/core",
+      "//components/signin/core/browser",
       "//components/ssl_config",
       "//components/startup_metric_utils/common",
       "//components/startup_metric_utils/browser",
@@ -228,7 +228,6 @@
       "//components/dom_distiller/ios",
       "//components/history/ios/browser",
       "//components/keyed_service/ios",
-      "//components/signin/ios/browser",
       "//components/translate/ios/browser",
       "//components/webp_transcode",
     ]
@@ -357,7 +356,6 @@
     "//components/search_engines:unit_tests",
     "//components/undo:unit_tests",
     "//components/leveldb_proto:unit_tests",
-    "//components/signin/core/browser:unit_tests",
     "//components/suggestions:unit_tests",
     "//components/translate/core/browser:unit_tests",
     "//components/translate/core/common:unit_tests",
@@ -431,6 +429,7 @@
       "//components/search_engines:unit_tests",
       "//components/search:unit_tests",
       "//components/search_provider_logos:unit_tests",
+      "//components/signin/core/browser:unit_tests",
       "//components/ssl_config:unit_tests",
       "//components/sync_bookmarks:unit_tests",
       "//components/sync_driver:unit_tests",
@@ -509,7 +508,6 @@
     }
   } else {
     deps += [
-      "//components/signin/ios/browser:unit_tests",
       "//components/translate/ios/browser:unit_tests",
       "//components/webp_transcode:unit_tests",
     ]

[commit-bot: I haz the power, 2015-11-19 02:53:56]

The CQ bit was unchecked by commit-bot@chromium.org