Fix origin trial name of ExperimentalHardwareEchoCancellation

Just a simple copy/paste error, I'm afraid.

Intent to Experiment: https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/3MYKIKqyaNA

Bug: chromium:776327
Change-Id: I07191b2c1c4a3c3eff69d9b4a5abd604ee6ba01a
Reviewed-on: https://chromium-review.googlesource.com/958906Reviewed-by: Philip Jägenstedt <foolip@chromium.org>
Commit-Queue: Oskar Sundbom <ossu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#543055}

third_party/WebKit/Source/platform/runtime_enabled_features.json5

@@ -396,7 +396,7 @@
     },
     {
       name: "ExperimentalHardwareEchoCancellation",
-      origin_trial_feature_name: "DisableHardwareNoiseSuppression",
+      origin_trial_feature_name: "ExperimentalHardwareEchoCancellation",
       status: "experimental",
     },
     {