Remove unused CallStacker

experimental/LightSymbolsUtil/lightsymbols/helper.h

-#include <stdlib.h>
-#define CANVAS_PATH "CANVAS_PATH"
-
-class SkFile {
-  FILE* file;
-  bool busted;
-  char* sz;
-  mutable int i;
-
-public:
-  SkFile(unsigned long id) {
-    file = NULL;
-    busted = false;
-    sz = new char[100000];
-    set(id);
-    i = 100;
-  }
-
-  ~SkFile() {
-    delete sz;
-    if (file) {
-      fclose(file);
-    }
-  }
-
-  void set(unsigned long id) {
-    if (busted) {
-      return;
-    }
-
-    if (file == NULL) {
-      char sz[10000];
-      sprintf(sz, "%s\\%ul.callstacks.txt", getenv(CANVAS_PATH), id);
-      file = fopen(sz, "a");
-      if (file == NULL) {
-        busted = true;
-      }
-      fprintf(file, "\n\n\nNEW SESSION, just coliding ids ... should generate a new file ideally ...  \n\n\n");
-    }
-  }
-
-  void appendLine(const char* sz) const {
-    if (busted) {
-      return;
-    }
-
-    fprintf(file, "%s\n", sz);
-  }
-
-  void dump(bool flush = false) const {
-    if (busted) {
-      return;
-    }
-
-    LightSymbol::GetCallStack(sz, 100000, " >- ");
-    appendLine(sz);
-
-    i--;
-
-    if (i < 0 || flush) {
-      i = 100;
-      fflush(file);
-    }
-  }
-};