Remove Enumeration Histograms from the Blink Platform API.

third_party/WebKit/Source/modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "modules/encryptedmedia/NavigatorRequestMediaKeySystemAccess.h"
 
 #include "bindings/core/v8/ScriptPromiseResolver.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "core/dom/DOMException.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/frame/OriginsUsingFeatures.h"
 #include "core/frame/UseCounter.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "modules/encryptedmedia/EncryptedMediaUtils.h"
 #include "modules/encryptedmedia/MediaKeySession.h"
 #include "modules/encryptedmedia/MediaKeySystemAccess.h"
 #include "modules/encryptedmedia/MediaKeysController.h"
 #include "platform/EncryptedMediaRequest.h"
+#include "platform/Histogram.h"
 #include "platform/Logging.h"
 #include "platform/network/ParsedContentType.h"
-#include "public/platform/Platform.h"
 #include "public/platform/WebEncryptedMediaClient.h"
 #include "public/platform/WebEncryptedMediaRequest.h"
 #include "public/platform/WebMediaKeySystemConfiguration.h"
 #include "public/platform/WebMediaKeySystemMediaCapability.h"
 #include "public/platform/WebVector.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
@@ skipping 150 matching lines @@
             if (capability.robustness.isEmpty()) {
                 hasEmptyRobustness = true;
                 break;
             }
         }
 
         if (hasEmptyRobustness)
             break;
     }
 
-    if (hasVideoCapabilities)
-        Platform::current()->histogramEnumeration("Media.EME.Widevine.VideoCapability.HasEmptyRobustness", hasEmptyRobustness, 2);
+    if (hasVideoCapabilities) {
+        DEFINE_THREAD_SAFE_STATIC_LOCAL(EnumerationHistogram, emptyRobustnessHistogram, new EnumerationHistogram("Media.EME.Widevine.VideoCapability.HasEmptyRobustness", 2));
+        emptyRobustnessHistogram.count(hasEmptyRobustness);
+    }
 
     if (hasEmptyRobustness) {
         m_resolver->executionContext()->addConsoleMessage(ConsoleMessage::create(JSMessageSource, WarningMessageLevel,
             "It is recommended that a robustness level be specified. Not specifying the robustness level could "
             "result in unexpected behavior in the future, potentially including failure to play."));
     }
 }
 
 } // namespace
 
@@ skipping 50 matching lines @@
     //    initialize the MediaKeySystemAccess object.
     MediaKeysController* controller = MediaKeysController::from(document->page());
     WebEncryptedMediaClient* mediaClient = controller->encryptedMediaClient(executionContext);
     mediaClient->requestMediaKeySystemAccess(WebEncryptedMediaRequest(initializer));
 
     // 8. Return promise.
     return promise;
 }
 
 } // namespace blink