Updates the CPUMemoryBenckmark test to load extension from test_extension to telemetry_extension.

Bug: 826072
Change-Id: Ifb817974924f60bfe68b5304f78f5412a367f154
Reviewed-on: https://chromium-review.googlesource.com/981526Reviewed-by: mark a. foltz <mfoltz@chromium.org>
Commit-Queue: mark a. foltz <mfoltz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#545971}

chrome/test/media_router/telemetry/benchmarks/media_router_benchmark.py

@@ -107,7 +107,7 @@ class CPUMemoryBenckmark(perf_benchmark.PerfBenchmark):
     options.AppendExtraBrowserArgs([
         '--load-extension=' +
              os.path.join(path_util.GetChromiumSrcDir(), 'out',
-             'Release', 'media_router', 'test_extension'),
+             'Release', 'media_router', 'telemetry_extension'),
         '--media-router=0',
         '--enable-stats-collection-bindings'
     ])