Remove / mark obsolete expired histograms

- Blink.CookieJar.SyncCookiesSetTime
- Blink.CookieJar.SyncCookiesTime

Bug: 1032107
Change-Id: I2bf177f31246ebb6eefe4fc5d50772614dce65c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2018904
Commit-Queue: Kinuko Yasuda <kinuko@chromium.org>
Auto-Submit: Kinuko Yasuda <kinuko@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735744}

third_party/blink/renderer/core/loader/cookie_jar.cc

@@ -21,7 +21,6 @@ void CookieJar::SetCookie(const String& value) {
     return;
 
   RequestRestrictedCookieManagerIfNeeded();
-  SCOPED_BLINK_UMA_HISTOGRAM_TIMER("Blink.CookieJar.SyncCookiesSetTime");
   backend_->SetCookieFromString(cookie_url, document_->SiteForCookies(),
                                 document_->TopFrameOrigin(), value);
 }
@@ -31,7 +30,6 @@ String CookieJar::Cookies() {
   if (cookie_url.IsEmpty())
     return String();
 
-  SCOPED_BLINK_UMA_HISTOGRAM_TIMER("Blink.CookieJar.SyncCookiesTime");
   RequestRestrictedCookieManagerIfNeeded();
   String value;
   backend_->GetCookiesString(cookie_url, document_->SiteForCookies(),

tools/metrics/histograms/histograms.xml

@@ -16453,6 +16453,9 @@ uploading your change for review.
 
 <histogram name="Blink.CookieJar.SyncCookiesSetTime" units="microseconds"
     expires_after="2020-01-20">
+  <obsolete>
+    Removed as of 01/20/2020.
+  </obsolete>
   <owner>kinuko@chromium.org</owner>
   <owner>dcheng@chromium.org</owner>
   <summary>
@@ -16468,6 +16471,9 @@ uploading your change for review.
 
 <histogram name="Blink.CookieJar.SyncCookiesTime" units="microseconds"
     expires_after="2020-01-20">
+  <obsolete>
+    Removed as of 01/20/2020.
+  </obsolete>
   <owner>kinuko@chromium.org</owner>
   <owner>dcheng@chromium.org</owner>
   <summary>