WebOTP: Remove extraneous call to TimeTicks:Now

TimeTicks::Now() is fairly cheap but not calling it twice is even
cheaper.

This CL is expected to have no functional impact.

Change-Id: I3b230d1ff22d29e88b594205c825bcbe68b6f558
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2252746
Auto-Submit: Majid Valipour <majidvp@chromium.org>
Reviewed-by: Sam Goto <goto@chromium.org>
Commit-Queue: Sam Goto <goto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780427}

content/browser/sms/sms_service.cc

@@ -103,7 +103,8 @@ void SmsService::OnReceive(const std::string& one_time_code) {
   DCHECK(!one_time_code_);
   DCHECK(!start_time_.is_null());
 
-  RecordSmsReceiveTime(base::TimeTicks::Now() - start_time_);
+  auto now = base::TimeTicks::Now();
+  RecordSmsReceiveTime(now - start_time_);
 
   one_time_code_ = one_time_code;
 
@@ -114,7 +115,7 @@ void SmsService::OnReceive(const std::string& one_time_code) {
     return;
   }
 
-  receive_time_ = base::TimeTicks::Now();
+  receive_time_ = now;
   OpenInfoBar(one_time_code);
 }