Remove Sparse Histograms from Blink Platform API.

third_party/WebKit/Source/core/dom/Document.cpp

Index: third_party/WebKit/Source/core/dom/Document.cpp
diff --git a/third_party/WebKit/Source/core/dom/Document.cpp b/third_party/WebKit/Source/core/dom/Document.cpp
index c41a910b05830dd6ac1c157ea7bd8c0aae5bc6b7..4d3879f0bf462007b32696b6634d67a7c6243500 100644
--- a/third_party/WebKit/Source/core/dom/Document.cpp
+++ b/third_party/WebKit/Source/core/dom/Document.cpp
@@ -199,6 +199,7 @@
 #include "core/xml/parser/XMLDocumentParser.h"
 #include "platform/DateComponents.h"
 #include "platform/EventDispatchForbiddenScope.h"
+#include "platform/Histogram.h"
 #include "platform/Language.h"
 #include "platform/LengthFunctions.h"
 #include "platform/Logging.h"
@@ -4472,7 +4473,9 @@ bool Document::execCommand(const String& commandName, bool, const String& value,
     EventQueueScope eventQueueScope;
     Editor::tidyUpHTMLStructure(*this);
     Editor::Command editorCommand = command(this, commandName);
-    Platform::current()->histogramSparse("WebCore.Document.execCommand", editorCommand.idForHistogram());
+
+    DEFINE_STATIC_LOCAL(SparseHistogram, editorCommandHistogram, ("WebCore.Document.execCommand"));
+    editorCommandHistogram.sample(editorCommand.idForHistogram());
     return editorCommand.execute(value);
 }