Rename kWebRtcThermalResource base::Feature name

The variable still has the "k" in its name, but the string name used in
--enable-features is now without it; "WebRtcThermalResource".

Bug: chromium:1094844
Change-Id: Id32c0de43b9fc7ab0b977defda675b1e3bfb4af3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2260633Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781310}

third_party/blink/renderer/modules/peerconnection/thermal_resource.cc

@@ -14,7 +14,7 @@ const int kReportIntervalSeconds = 10;
 
 }  // namespace
 
-const base::Feature kWebRtcThermalResource{"kWebRtcThermalResource",
+const base::Feature kWebRtcThermalResource{"WebRtcThermalResource",
                                            base::FEATURE_DISABLED_BY_DEFAULT};
 
 // static