Remove custom counts histogram from the blink API.

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

Index: third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp b/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
index eb0cc5608fc6e02c902f86038dfdfc1ec58adfac..623dd6a86a2e01996e000812c396400e8c168ce0 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptController.cpp
@@ -68,6 +68,7 @@
 #include "core/loader/NavigationScheduler.h"
 #include "core/loader/ProgressTracker.h"
 #include "core/plugins/PluginView.h"
+#include "platform/Histogram.h"
 #include "platform/NotImplemented.h"
 #include "platform/TraceEvent.h"
 #include "platform/UserGestureIndicator.h"
@@ -134,7 +135,9 @@ void ScriptController::clearForClose()
 {
     double start = currentTime();
     m_windowProxyManager->clearForClose();
-    Platform::current()->histogramCustomCounts("WebCore.ScriptController.clearForClose", (currentTime() - start) * 1000, 0, 10000, 50);
+    double end = currentTime();
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, clearForCloseHistogram, new CustomCountHistogram("WebCore.ScriptController.clearForClose", 0, 10000, 50));

[esprehn, 2016/02/04 23:25:23]

this doesn't need to be thread safe, ScriptController is main thread only.

+    clearForCloseHistogram.count((end - start) * 1000);
 }
 
 void ScriptController::updateSecurityOrigin(SecurityOrigin* origin)
@@ -410,7 +413,9 @@ void ScriptController::clearWindowProxy()
     clearScriptObjects();
 
     m_windowProxyManager->clearForNavigation();
-    Platform::current()->histogramCustomCounts("WebCore.ScriptController.clearWindowProxy", (currentTime() - start) * 1000, 0, 10000, 50);
+    double end = currentTime();
+    DEFINE_THREAD_SAFE_STATIC_LOCAL(CustomCountHistogram, clearWindowProxyHistogram, new CustomCountHistogram("WebCore.ScriptController.clearWindowProxy", 0, 10000, 50));

[esprehn, 2016/02/04 23:25:23]

ditto

+    clearWindowProxyHistogram.count((end - start) * 1000);
 }
 
 void ScriptController::setCaptureCallStackForUncaughtExceptions(v8::Isolate* isolate, bool value)