chromium.fyi fixes

* Libfuzz builders use a lot of bots, let scheduler handle it.
* remove ios-webview

Bug: 840631
Change-Id: I4d7491a76863f82986c641c76118933838e755dd
Reviewed-on: https://chromium-review.googlesource.com/1103548Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567847}

infra/config/global/luci-milo.cfg

@@ -2476,10 +2476,6 @@ consoles {
     name: "buildbucket/luci.chromium.ci/Linux Viz"
     category: "viz"
   }
-  builders {
-    name: "buildbucket/luci.chromium.ci/ios-webview"
-    category: "web_view"
-  }
   builders {
     name: "buildbucket/luci.chromium.ci/Win 10 Fast Ring"
     category: "win10"
@@ -2882,10 +2878,6 @@ consoles {
     name: "buildbucket/luci.chromium.ci/Linux Viz"
     category: "viz"
   }
-  builders {
-    name: "buildbucket/luci.chromium.ci/ios-webview"
-    category: "web_view"
-  }
   builders {
     name: "buildbot/chromium.fyi/Win 10 Fast Ring"
     name: "buildbucket/luci.chromium.ci/Win 10 Fast Ring"

infra/config/global/luci-scheduler.cfg

@@ -2179,6 +2179,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Afl Upload Linux ASan"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 4
+  }
 }
 
 job {
@@ -2547,6 +2550,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Libfuzzer Upload Linux ASan"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 5
+  }
 }
 
 job {
@@ -2557,6 +2563,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Libfuzzer Upload Linux ASan Debug"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 5
+  }
 }
 
 job {
@@ -2567,6 +2576,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Libfuzzer Upload Linux MSan"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 5
+  }
 }
 
 job {
@@ -2577,6 +2589,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Libfuzzer Upload Linux UBSan"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 5
+  }
 }
 
 job {
@@ -2587,6 +2602,9 @@ job {
     bucket: "luci.chromium.ci"
     builder: "Libfuzzer Upload Mac ASan"
   }
+  triggering_policy: {
+    max_concurrent_invocations: 3
+  }
 }
 
 job {
@@ -3585,16 +3603,6 @@ job {
   }
 }
 
-job {
-  id: "ios-webview"
-  acl_sets: "default"
-  buildbucket: {
-    server: "cr-buildbucket.appspot.com"
-    bucket: "luci.chromium.ci"
-    builder: "ios-webview"
-  }
-}
-
 job {
   id: "linux-annotator-rel"
   acl_sets: "default"