Remove custom counts histogram from the blink API.

third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp

Index: third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
index 9473fd758c0e146e17e297cc85954d3df6e1c699..8752c97c417bd3cd9ffc2b9869719f680b1b545a 100644
--- a/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
@@ -53,6 +53,7 @@
 #include "core/loader/DocumentLoader.h"
 #include "core/loader/FrameLoader.h"
 #include "core/loader/FrameLoaderClient.h"
+#include "platform/Histogram.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/TraceEvent.h"
@@ -334,10 +335,13 @@ void WindowProxy::createContext()
     m_scriptState = ScriptState::create(context, m_world);
 
     double contextCreationDurationInMilliseconds = (currentTime() - contextCreationStartInSeconds) * 1000;
-    const char* histogramName = "WebCore.WindowProxy.createContext.MainWorld";
-    if (!m_world->isMainWorld())
-        histogramName = "WebCore.WindowProxy.createContext.IsolatedWorld";
-    Platform::current()->histogramCustomCounts(histogramName, contextCreationDurationInMilliseconds, 0, 10000, 50);
+    if (!m_world->isMainWorld()) {
+        DEFINE_STATIC_LOCAL(CustomCountHistogram, isolatedWorldHistogram, ("WebCore.WindowProxy.createContext.IsolatedWorld", 0, 10000, 50));
+        isolatedWorldHistogram.count(contextCreationDurationInMilliseconds);
+    } else {
+        DEFINE_STATIC_LOCAL(CustomCountHistogram, mainWorldHistogram, ("WebCore.WindowProxy.createContext.MainWorld", 0, 10000, 50));
+        mainWorldHistogram.count(contextCreationDurationInMilliseconds);
+    }
 }
 
 static v8::Local<v8::Object> toInnerGlobalObject(v8::Local<v8::Context> context)