base: Remove the string logging from CHECK().

content/browser/webrtc/webrtc_getusermedia_browsertest.cc

Index: content/browser/webrtc/webrtc_getusermedia_browsertest.cc
diff --git a/content/browser/webrtc/webrtc_getusermedia_browsertest.cc b/content/browser/webrtc/webrtc_getusermedia_browsertest.cc
index 36bb9a64721b67b898decb7dd4ac7374e2be8838..a54ad7d74c64663504841dab4646db3e86b400c1 100644
--- a/content/browser/webrtc/webrtc_getusermedia_browsertest.cc
+++ b/content/browser/webrtc/webrtc_getusermedia_browsertest.cc
@@ -108,7 +108,8 @@ class WebRtcGetUserMediaBrowserTest : public WebRtcContentBrowserTestBase {
   ~WebRtcGetUserMediaBrowserTest() override {}
 
   void StartTracing() {
-    CHECK(trace_log_ == NULL) << "Can only can start tracing once";
+    // Can only can start tracing once
+    CHECK(trace_log_ == NULL);
     trace_log_ = base::trace_event::TraceLog::GetInstance();
     base::trace_event::TraceConfig trace_config(
         "video", base::trace_event::RECORD_UNTIL_FULL);
@@ -119,8 +120,8 @@ class WebRtcGetUserMediaBrowserTest : public WebRtcContentBrowserTestBase {
   }
 
   void StopTracing() {
-    CHECK(message_loop_runner_.get() == NULL)
-        << "Calling StopTracing more than once";
+    // Calling StopTracing more than once
+    CHECK(message_loop_runner_.get() == NULL);
 
     {
       base::ThreadRestrictions::ScopedAllowIO allow_thread_join_caused_by_test;