Bump the heapcheck test timeout to 1 hour

This is just slow growth of the time to run the unit_tests target under
heapcheck.

TBR=dhollowa@chromium.org
Review URL: https://codereview.chromium.org/14069009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193428 0039d316-1c4b-4281-b951-d872f2087c98

tools/heapcheck/heapcheck_test.py

@@ -24,7 +24,7 @@ class HeapcheckWrapper(object):
 
   def __init__(self, supp_files):
     self._mode = 'strict'
-    self._timeout = 1800
+    self._timeout = 3600
     self._nocleanup_on_exit = False
     self._suppressions = []
     for fname in supp_files: