Remove Android.WebView.CookieManager.SameSite* histograms

These are no longer needed.

Bug: 1165012
Change-Id: I4c0c9bdf824359bc55686b67a293cf8203af6512
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2627694Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Commit-Queue: Lily Chen <chlily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843261}

android_webview/browser/cookie_manager.cc

@@ -27,7 +27,6 @@
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/metrics/histogram_functions.h"
-#include "base/metrics/histogram_macros.h"
 #include "base/no_destructor.h"
 #include "base/optional.h"
 #include "base/path_service.h"
@@ -96,21 +95,12 @@ enum class SecureCookieAction {
   kMaxValue = kDisallowedAndroidR,
 };
 
-// Since this function parses the set-cookie line into a ParsedCookie, it is
-// convenient to hook into here to get the SameSite value from the parsed
-// cookie for histogramming.
-GURL MaybeFixUpSchemeForSecureCookieAndGetSameSite(
-    const GURL& host,
+GURL MaybeFixUpSchemeForSecureCookie(const GURL& host,
                                      const std::string& value,
                                      bool workaround_http_secure_cookies,
-    net::CookieSameSiteString* samesite_out,
                                      bool* should_allow_cookie) {
   net::ParsedCookie parsed_cookie(value);
 
-  // Grab the SameSite value for histogramming.
-  DCHECK(samesite_out);
-  parsed_cookie.SameSite(samesite_out);
-
   *should_allow_cookie = true;
 
   // Log message for catching strict secure cookies related bugs.
@@ -471,14 +461,9 @@ void CookieManager::SetCookieHelper(const GURL& host,
                                     base::OnceCallback<void(bool)> callback) {
   DCHECK(cookie_store_task_runner_->RunsTasksInCurrentSequence());
 
-  net::CookieSameSiteString samesite = net::CookieSameSiteString::kUnspecified;
   bool should_allow_cookie = true;
-  const GURL& new_host = MaybeFixUpSchemeForSecureCookieAndGetSameSite(
-      host, value, workaround_http_secure_cookies_, &samesite,
-      &should_allow_cookie);
-
-  UMA_HISTOGRAM_ENUMERATION(
-      "Android.WebView.CookieManager.SameSiteAttributeValue", samesite);
+  const GURL& new_host = MaybeFixUpSchemeForSecureCookie(
+      host, value, workaround_http_secure_cookies_, &should_allow_cookie);
 
   net::CookieInclusionStatus status;
   std::unique_ptr<net::CanonicalCookie> cc(
@@ -490,11 +475,6 @@ void CookieManager::SetCookieHelper(const GURL& host,
     return;
   }
 
-  if (cc->SameSite() == net::CookieSameSite::NO_RESTRICTION) {
-    UMA_HISTOGRAM_BOOLEAN("Android.WebView.CookieManager.SameSiteNoneIsSecure",
-                          cc->IsSecure());
-  }
-
   // Note: CookieStore and network::CookieManager both accept a
   // CookieAccessResult callback. WebView only cares about boolean success,
   // which is why we use |AdaptCookieAccessResultToBool|. This is temporary

tools/metrics/histograms/histograms_xml/android/histograms.xml

@@ -2310,6 +2310,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram name="Android.WebView.CookieManager.SameSiteAttributeValue"
     enum="CookieSameSiteString" expires_after="M90">
+  <obsolete>
+    Removed Jan 2021 for cleanup (no longer needed): https://crbug.com/1165012
+  </obsolete>
   <owner>chlily@chromium.org</owner>
   <owner>torne@chromium.org</owner>
   <summary>
@@ -2322,6 +2325,9 @@ reviews. Googlers can read more about this at go/gwsq-gerrit.
 
 <histogram name="Android.WebView.CookieManager.SameSiteNoneIsSecure"
     enum="Boolean" expires_after="M90">
+  <obsolete>
+    Removed Jan 2021 for cleanup (no longer needed): https://crbug.com/1165012
+  </obsolete>
   <owner>chlily@chromium.org</owner>
   <owner>torne@chromium.org</owner>
   <summary>