Remove the core dump support (#2183)

* Remove the core dump support

* remove core settings

* Extend timeout for the categories test

Author: jcollins-g

.travis.yml

@@ -24,12 +24,8 @@ install:
 - ./tool/install_travis.sh
 
 before_script:
-- ulimit -c unlimited -S
 - pub get
 
-after_failure:
-- ./tool/after_failure_travis.sh
-
 before_install:
   # Disable non-blocking I/O for stdout, stderr https://github.com/travis-ci/travis-ci/issues/4704#issuecomment-348435959
   - python -c 'import os,sys,fcntl; flags = fcntl.fcntl(sys.stdout, fcntl.F_GETFL); fcntl.fcntl(sys.stdout, fcntl.F_SETFL, flags&~os.O_NONBLOCK);'

test/model_special_cases_test.dart

@@ -290,7 +290,7 @@ void main() {
       List<Category> packageCategories =
           packageGraphSmall.localPackages.first.categories;
       expect(packageCategories.length, equals(0));
-    });
+    }, timeout: Timeout.factor(2));
   });
 
   group('Package', () {

tool/after_failure_travis.sh

@@ -8,8 +8,6 @@
 set -x
 
 if uname | grep -q Linux ; then
-  sudo apt-get update
-  sudo apt-get install -y gdb
   sudo gem install coveralls-lcov
   coveralls-lcov --help
 fi