[DevTools] Change network label from "Online" to "No throttling"

Screenshots: https://bugs.chromium.org/p/chromium/issues/detail?id=930043#c10
Bug: 930043
Change-Id: I6b47bedfed778a81202c1cc9364e603483556019
Reviewed-on: https://chromium-review.googlesource.com/c/1493090Reviewed-by: Erik Luo <luoe@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636293}

third_party/blink/renderer/devtools/front_end/sdk/NetworkManager.js

@@ -229,7 +229,7 @@ SDK.NetworkManager.Conditions;
 
 /** @type {!SDK.NetworkManager.Conditions} */
 SDK.NetworkManager.NoThrottlingConditions = {
-  title: Common.UIString('Online'),
+  title: Common.UIString('No throttling'),
   download: -1,
   upload: -1,
   latency: 0

third_party/blink/web_tests/http/tests/devtools/throttling/mobile-throttling-expected.txt

@@ -4,11 +4,11 @@ Initial throttling state
 === THROTTLING STATE ===
 Network throttling - download: -1 upload: -1 latency: 0
 CPU throttling rate: 1
-Device mode throttling: Online
+Device mode throttling: No throttling
 Network panel offline checkbox: false
-Network panel throttling: Online
-Network conditions drawer throttling: Online
-Performance panel network throttling: Online
+Network panel throttling: No throttling
+Network conditions drawer throttling: No throttling
+Performance panel network throttling: No throttling
 Performance panel CPU throttling: No throttling
 ========================
 
@@ -28,11 +28,11 @@ Toggle network offline checkbox
 === THROTTLING STATE ===
 Network throttling - download: -1 upload: -1 latency: 0
 CPU throttling rate: 1
-Device mode throttling: Online
+Device mode throttling: No throttling
 Network panel offline checkbox: false
-Network panel throttling: Online
-Network conditions drawer throttling: Online
-Performance panel network throttling: Online
+Network panel throttling: No throttling
+Network conditions drawer throttling: No throttling
+Performance panel network throttling: No throttling
 Performance panel CPU throttling: No throttling
 ========================
 
@@ -124,11 +124,11 @@ Change to no throttling in device mode
 === THROTTLING STATE ===
 Network throttling - download: -1 upload: -1 latency: 0
 CPU throttling rate: 1
-Device mode throttling: Online
+Device mode throttling: No throttling
 Network panel offline checkbox: false
-Network panel throttling: Online
-Network conditions drawer throttling: Online
-Performance panel network throttling: Online
+Network panel throttling: No throttling
+Network conditions drawer throttling: No throttling
+Performance panel network throttling: No throttling
 Performance panel CPU throttling: No throttling
 ========================