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

runtime/vm/cpuinfo_android.cc

Index: runtime/vm/cpuinfo_android.cc
diff --git a/runtime/vm/cpuinfo_android.cc b/runtime/vm/cpuinfo_android.cc
index e4e4826afcfeab6711a7a0d05bf98766452cd13e..1e4229ca5a0ed59ca812de6a398775839bea53ad 100644
--- a/runtime/vm/cpuinfo_android.cc
+++ b/runtime/vm/cpuinfo_android.cc
@@ -52,25 +52,12 @@ bool CpuInfo::FieldContains(CpuInfoIndices idx, const char* search_string) {
 }
 
 
-bool CpuInfo::FieldContainsByString(const char* field,
-                                    const char* search_string) {
-  ASSERT(method_ != kCpuInfoDefault);
-  return ProcCpuInfo::FieldContains(field, search_string);
-}
-
-
 const char* CpuInfo::ExtractField(CpuInfoIndices idx) {
   ASSERT(method_ != kCpuInfoDefault);
   return ProcCpuInfo::ExtractField(FieldName(idx));
 }
 
 
-const char* CpuInfo::ExtractFieldByString(const char* field) {
-  ASSERT(method_ != kCpuInfoDefault);
-  return ProcCpuInfo::ExtractField(field);
-}
-
-
 bool CpuInfo::HasField(const char* field) {
   ASSERT(method_ != kCpuInfoDefault);
   return ProcCpuInfo::HasField(field);