Revert increased limit for m_selectorIndex.

third_party/WebKit/Source/core/css/RuleSetTest.cpp

 /*
  * Copyright (c) 2014, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 181 matching lines @@
 
   helper.addCSSRules(".foo:host-context(*) { }");
   RuleSet& ruleSet = helper.ruleSet();
   const HeapVector<RuleData>* rules = ruleSet.shadowHostRules();
   ASSERT_EQ(0u, rules->size());
 }
 
 TEST(RuleSetTest, SelectorIndexLimit) {
   StringBuilder builder;
 
-  for (unsigned i = 0; i < 16383; i++)
+  // We use 13 bits to storing the selector start index in RuleData. This is a
+  // test to check that we don't regress. We WONTFIX issues asking for more
+  // since 2^13 simple selectors in a style rule is already excessive.
+  for (unsigned i = 0; i < 8191; i++)
     builder.append("div,");
 
   builder.append("b,span {}");
 
   CSSTestHelper helper;
   helper.addCSSRules(builder.toString().ascii().data());
   const RuleSet& ruleSet = helper.ruleSet();
   const HeapTerminatedArray<RuleData>* rules = ruleSet.tagRules("b");
   ASSERT_EQ(1u, rules->size());
   EXPECT_EQ("b", rules->at(0).selector().tagQName().localName());
   EXPECT_FALSE(ruleSet.tagRules("span"));
 }
 
 }  // namespace blink