1. Fix memory leaks reported by running a simple test using ASAN

runtime/vm/cpuinfo.h

Index: runtime/vm/cpuinfo.h
diff --git a/runtime/vm/cpuinfo.h b/runtime/vm/cpuinfo.h
index cd1247ea22b8600b9cfb205502863a205c5d7f16..95b6ec3c6148937d60a755087a591907c38bc99f 100644
--- a/runtime/vm/cpuinfo.h
+++ b/runtime/vm/cpuinfo.h
@@ -45,16 +45,10 @@ class CpuInfo : public AllStatic {
 
   // Returns true if the cpuinfo field contains the string.
   static bool FieldContains(CpuInfoIndices idx, const char* search_string);
-  static bool FieldContainsByString(
-      const char* field, const char* search_string);
 
   // Returns true if the cpuinfo field [field] exists and is non-empty.
   static bool HasField(const char* field);
 
-  // Returns the field. Caller is responsible for freeing the result.
-  static const char* ExtractField(CpuInfoIndices idx);
-  static const char* ExtractFieldByString(const char* field);
-
   // Returns the field describing the CPU model. Caller is responsible for
   // freeing the result.
   static const char* GetCpuModel() {
@@ -66,6 +60,9 @@ class CpuInfo : public AllStatic {
   }
 
  private:
+  // Returns the field. Caller is responsible for freeing the result.
+  static const char* ExtractField(CpuInfoIndices idx);
+
   // The method to use to acquire info about the CPU.
   static CpuInfoMethod method_;