remove SkInstCnt

It's been outclassed by Valgrind and leak sanitizer,
and it seems to be causing problems for external folks building Skia.

I'm not sure why our own builds seem unaffected.

Latest thread:
https://groups.google.com/forum/#!topic/skia-discuss/oj9FsQwwSF0

BUG=skia:

Review URL: https://codereview.chromium.org/1217573002
diff --git a/tests/LListTest.cpp b/tests/LListTest.cpp
index 34bbb4d..3d19215 100644
--- a/tests/LListTest.cpp
+++ b/tests/LListTest.cpp
@@ -5,7 +5,6 @@
  * found in the LICENSE file.
  */
 
-#include "SkInstCnt.h"
 #include "SkRandom.h"
 #include "SkTInternalLList.h"
 #include "SkTLList.h"
@@ -17,15 +16,10 @@
     }
     bool operator== (const ListElement& other) { return fID == other.fID; }
 
-#if SK_ENABLE_INST_COUNT
-    // Make the instance count available publicly.
-    static int InstanceCount() { return GetInstanceCount(); }
-#endif
-
     int fID;
 
 private:
-    SK_DECLARE_INST_COUNT(ListElement);
+
     SK_DECLARE_INTERNAL_LLIST_INTERFACE(ListElement);
 };
 
@@ -134,10 +128,6 @@
         Iter iter3;
         Iter iter4;
 
-#if SK_ENABLE_INST_COUNT
-        SkASSERT(0 == ListElement::InstanceCount());
-#endif
-
         REPORTER_ASSERT(reporter, list1.isEmpty());
         REPORTER_ASSERT(reporter, NULL == iter1.init(list1, Iter::kHead_IterStart));
         REPORTER_ASSERT(reporter, NULL == iter1.init(list1, Iter::kTail_IterStart));
@@ -150,9 +140,6 @@
         // Create two identical lists, one by appending to head and the other to the tail.
         list1.addToHead(ListElement(1));
         list2.addToTail(ListElement(1));
-#if SK_ENABLE_INST_COUNT
-        SkASSERT(2 == ListElement::InstanceCount());
-#endif
         iter1.init(list1, Iter::kHead_IterStart);
         iter2.init(list1, Iter::kTail_IterStart);
         REPORTER_ASSERT(reporter, iter1.get()->fID == iter2.get()->fID);
@@ -177,10 +164,6 @@
         iter4.init(list2, Iter::kTail_IterStart);
         list2.addToHead(ListElement(2));
 
-#if SK_ENABLE_INST_COUNT
-        SkASSERT(3 == ListElement::InstanceCount());
-#endif
-
         REPORTER_ASSERT(reporter, iter3.get()->fID == iter1.get()->fID);
         REPORTER_ASSERT(reporter, iter4.get()->fID == iter1.get()->fID);
         REPORTER_ASSERT(reporter, 1 == Iter(list2, Iter::kTail_IterStart).get()->fID);
@@ -188,16 +171,10 @@
         REPORTER_ASSERT(reporter, list1 != list2);
         list1.addToHead(ListElement(2));
         REPORTER_ASSERT(reporter, list1 == list2);
-#if SK_ENABLE_INST_COUNT
-        SkASSERT(4 == ListElement::InstanceCount());
-#endif
         REPORTER_ASSERT(reporter, !list1.isEmpty());
 
         list1.reset();
         list2.reset();
-#if SK_ENABLE_INST_COUNT
-        SkASSERT(0 == ListElement::InstanceCount());
-#endif
         REPORTER_ASSERT(reporter, list1.isEmpty() && list2.isEmpty());
 
         // randomly perform insertions and deletions on a list and perform tests
@@ -300,14 +277,8 @@
                 --count;
             }
             REPORTER_ASSERT(reporter, count == list1.count());
-#if SK_ENABLE_INST_COUNT
-            SkASSERT(count == ListElement::InstanceCount());
-#endif
         }
         list1.reset();
-#if SK_ENABLE_INST_COUNT
-        SkASSERT(0 == ListElement::InstanceCount());
-#endif
     }
 }