Remove custom counts histogram from the blink API.

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index 2ff91792932a6d924ba97677c3336d9e56659430..8f4793b22fa5b8956afa4787b546fd5e362e9410 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -443,8 +443,6 @@ public:
     virtual WebUnitTestSupport* unitTestSupport() { return nullptr; }
 
     // Callbacks for reporting histogram data.
-    // CustomCounts histogram has exponential bucket sizes, so that min=1, max=1000000, bucketCount=50 would do.
-    virtual void histogramCustomCounts(const char* name, int sample, int min, int max, int bucketCount) { }
     // Enumeration histogram buckets are linear, boundaryValue should be larger than any possible sample value.
     virtual void histogramEnumeration(const char* name, int sample, int boundaryValue) { }