Switch from DRT to content shell.

tools/testing/drt-trampoline.py

Index: tools/testing/drt-trampoline.py
diff --git a/tools/testing/drt-trampoline.py b/tools/testing/drt-trampoline.py
index ac5b23d690af3de4017eebf27fa14da8ecb55ada..fc59861a1169cf87f0b30cff726a711fb7998ec9 100644
--- a/tools/testing/drt-trampoline.py
+++ b/tools/testing/drt-trampoline.py
@@ -3,7 +3,7 @@
 # BSD-style license that can be found in the LICENSE file.
 #
 # For now we have to use this trampoline to turn --dart-flags command line
-# switch into env variable DART_FLAGS.  Eventually, DumpRenderTree should
+# switch into env variable DART_FLAGS.  Eventually, Content shell should
 # support --dart-flags and this hack may go away.
 #
 # Expected invocation: python drt-trampoline.py <path to DRT> <DRT command line>
@@ -132,8 +132,8 @@ def main(argv):
       print 'FAIL'
       print 'Expectation didn\'t match.\n'
       if len(output) == 0:
-        print ('\033[31mERROR\033[0m: DumpRenderTree generated an empty pixel '
-            'output! This is commonly an error in executing DumpRenderTree, and'
+        print ('\033[31mERROR\033[0m: Content shell generated an empty pixel '
+            'output! This is commonly an error in executing content shell, and'
             ' not that expectations are out of date.\n')
       print 'You can update expectations by running:\n'
       print 'cp %s %s\n' % (out_file, out_expected_file)