[css-typed-om] Remove LOG from CSSNumericValueType.

A stray LOG was accidentally left in the code.

Change-Id: I39ba40d5459b1061579785c1ed11f28e8a381069
Reviewed-on: https://chromium-review.googlesource.com/762832
Commit-Queue: Darren Shen <shend@chromium.org>
Reviewed-by: meade_UTC10 <meade@chromium.org>
Cr-Commit-Position: refs/heads/master@{#515509}

third_party/WebKit/Source/core/css/cssom/CSSNumericValueType.cpp

@@ -14,7 +14,6 @@ CSSNumericValueType::BaseType UnitTypeToBaseType(
   using BaseType = CSSNumericValueType::BaseType;
 
   DCHECK_NE(unit, UnitType::kNumber);
-  LOG(ERROR) << (int)unit;
   switch (unit) {
     case UnitType::kEms:
     case UnitType::kExs: