[ios] Drop some iOS12 duplicate tests, and shard settings_egtest.

Reduce some duplicative tests between iOS12 vs 13. In general it's good
to test both iOS versions here, but cycle time for both builders are
getting too high.

Bug: 992500
Change-Id: I6d6d30e66c8cb8320c20d934e05167e43d8d2282
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1756150
Auto-Submit: Justin Cohen <justincohen@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#687296}

ios/build/bots/chromium.mac/ios-simulator-full-configs.json

@@ -18,14 +18,6 @@
   ],
   "configuration": "Debug",
   "tests": [
-    {
-      "include": "eg_tests.json",
-      "device type": "iPhone 7",
-      "os": "12.1",
-      "host os": "Mac-10.14.4",
-      "pool":"Chrome",
-      "priority": 30
-    },
     {
       "include": "eg_tests.json",
       "device type": "iPad Air 2",
@@ -42,14 +34,6 @@
       "pool":"Chrome",
       "priority": 30
     },
-    {
-      "include": "eg_cq_tests.json",
-      "device type": "iPhone X",
-      "os": "12.1",
-      "host os": "Mac-10.14.4",
-      "pool":"Chrome",
-      "priority": 30
-    },
     {
       "include": "eg_cq_tests.json",
       "device type": "iPad Air 2",

ios/build/bots/chromium.mac/ios-simulator.json

@@ -19,22 +19,6 @@
   ],
   "configuration": "Debug",
   "tests": [
-    {
-      "include": "screen_size_dependent_tests.json",
-      "device type": "iPhone 6s Plus",
-      "os": "12.1",
-      "host os": "Mac-10.14.4",
-      "pool":"Chrome",
-      "priority": 30
-    },
-    {
-      "include": "screen_size_dependent_tests.json",
-      "device type": "iPhone 6s",
-      "os": "12.1",
-      "host os": "Mac-10.14.4",
-      "pool":"Chrome",
-      "priority": 30
-    },
     {
       "include": "common_tests.json",
       "device type": "iPhone 6s",
@@ -43,14 +27,6 @@
       "pool":"Chrome",
       "priority": 30
     },
-    {
-      "include": "screen_size_dependent_tests.json",
-      "device type": "iPad Air 2",
-      "os": "12.1",
-      "host os": "Mac-10.14.4",
-      "pool":"Chrome",
-      "priority": 30
-    },
     {
       "include": "eg_cq_tests.json",
       "device type": "iPhone 6s",
@@ -75,6 +51,14 @@
       "pool":"Chrome",
       "priority": 30
     },
+    {
+      "include": "screen_size_dependent_tests.json",
+      "device type": "iPhone SE",
+      "os": "13.0",
+      "host os": "Mac-10.14.4",
+      "pool":"Chrome",
+      "priority": 30
+    },
     {
       "include": "common_tests.json",
       "device type": "iPhone 6s",

ios/build/bots/tests/eg_tests.json

@@ -16,7 +16,8 @@
     {
       "app": "ios_chrome_settings_egtests",
       "xcode parallelization": true,
-      "shards": 3
+      "shards": 1,
+      "shard size": 5
     },
     {
       "app": "ios_chrome_translate_egtests",