[getUserMedia] Address old comments by folding initialization.

Same as crrev.com/c/1373817, as I forgot to remove this one too in the
previous CL since I did not catch it.

BUG=736309
TESTED=ninja -C out/Default/ content_unittests && ./out/Default/content_unittests

Change-Id: I2d645cfcf65640b7a4a4623976be5642d32d30d2
Reviewed-on: https://chromium-review.googlesource.com/c/1373824Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Armando Miraglia <armax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#615902}

content/renderer/media/stream/media_stream_constraints_util_audio_unittest.cc

@@ -1236,9 +1236,7 @@ TEST_P(MediaStreamConstraintsUtilAudioTest, AdvancedConflictingLastConstraint) {
   auto result = SelectSettings();
   EXPECT_TRUE(result.HasValue());
   CheckDeviceDefaults(result);
-  // TODO(crbug.com/736309): Fold this local when clang is fixed.
-  auto hotword_enabled = &AudioCaptureSettings::hotword_enabled;
-  CheckBoolDefaults({hotword_enabled},
+  CheckBoolDefaults({&AudioCaptureSettings::hotword_enabled},
                     {&AudioProcessingProperties::goog_audio_mirroring,
                      &AudioProcessingProperties::goog_highpass_filter},
                     result);