Fix Linux ASAN bots failing.
My previous change to test_env.py broken this.
BUG=414808
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Review URL: https://codereview.chromium.org/641113003
Cr-Commit-Position: refs/heads/master@{#298888}
diff --git a/testing/test_env.py b/testing/test_env.py
index d91d3c1..67b6d86 100755
--- a/testing/test_env.py
+++ b/testing/test_env.py
@@ -85,7 +85,7 @@
if lsan and sys.platform == 'linux2':
# Use the debug version of libstdc++ under LSan. If we don't, there will
# be a lot of incomplete stack traces in the reports.
- env['LD_LIBRARY_PATH'] += '/usr/lib/x86_64-linux-gnu/debug:'
+ env['LD_LIBRARY_PATH'] = '/usr/lib/x86_64-linux-gnu/debug:'
if asan and sys.platform == 'darwin':
isolate_output_dir = os.path.abspath(os.path.dirname(cmd[0]))
