Disable net_url_request_ftp_fuzzer.

The test is timing out under Cluserfuzz, which likely discovered yet
again that it can DoS slow, memory-instrumented fuzzers with large
inputs.

Also move the disabled fuzzer into the !disable_ftp_support block with
the other FTP fuzzers, so that if we ever run fuzzers on platforms
where we don't enable FTP support, we won't run into build issues.

Bug: 962087
Change-Id: Iffb366ee6d07f0be190785e26e029baa21b8b9e1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610300Reviewed-by: Eric Roman <eroman@chromium.org>
Commit-Queue: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659106}

net/BUILD.gn

@@ -6340,6 +6340,24 @@ if (!disable_ftp_support) {
     # understood (probably just needs to restrict maximum input size).
     additional_configs = [ "//testing/libfuzzer:no_clusterfuzz" ]
   }
+
+  fuzzer_test("net_url_request_ftp_fuzzer") {
+    sources = [
+      "url_request/url_request_ftp_fuzzer.cc",
+    ]
+    deps = [
+      ":net_fuzzer_test_support",
+      ":test_support",
+      "//base",
+      "//net",
+    ]
+    dict = "data/fuzzer_dictionaries/net_url_request_ftp_fuzzer.dict"
+    seed_corpus = "data/fuzzer_data/net_url_request_ftp_fuzzer/"
+
+    # TODO(https://crbug.com/962087): Re-enable once source of timeout is
+    # understood (probably just needs to restrict maximum input size).
+    additional_configs = [ "//testing/libfuzzer:no_clusterfuzz" ]
+  }
 }
 
 fuzzer_test("net_unescape_url_component_fuzzer") {
@@ -6473,20 +6491,6 @@ fuzzer_test("net_socks5_client_socket_fuzzer") {
   ]
 }
 
-fuzzer_test("net_url_request_ftp_fuzzer") {
-  sources = [
-    "url_request/url_request_ftp_fuzzer.cc",
-  ]
-  deps = [
-    ":net_fuzzer_test_support",
-    ":test_support",
-    "//base",
-    "//net",
-  ]
-  dict = "data/fuzzer_dictionaries/net_url_request_ftp_fuzzer.dict"
-  seed_corpus = "data/fuzzer_data/net_url_request_ftp_fuzzer/"
-}
-
 fuzzer_test("net_url_request_fuzzer") {
   sources = [
     "url_request/url_request_fuzzer.cc",