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

runtime/vm/cpuinfo_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include "vm/cpuinfo.h"
 #include "vm/cpuid.h"
 #include "vm/proccpuinfo.h"
@@ skipping 49 matching lines @@
     CpuId::Cleanup();
   } else {
     ASSERT(method_ == kCpuInfoSystem);
     ProcCpuInfo::Cleanup();
   }
 }
 
 
 bool CpuInfo::FieldContains(CpuInfoIndices idx, const char* search_string) {
   if (method_ == kCpuInfoCpuId) {
-    return strstr(CpuId::field(idx), search_string);
+    const char* field = CpuId::field(idx);
+    bool contains = (strstr(field, search_string) != NULL);
+    free(const_cast<char*>(field));
+    return contains;
   } else {
     ASSERT(method_ == kCpuInfoSystem);
     return ProcCpuInfo::FieldContains(FieldName(idx), search_string);
   }
 }
 
 
-bool CpuInfo::FieldContainsByString(const char* field,
-                                    const char* search_string) {
-  if (method_ == kCpuInfoCpuId) {
-    for (int i = 0; i < kCpuInfoMax; i++) {
-      if (strcmp(field, fields_[i]) == 0) {
-        return FieldContains(static_cast<CpuInfoIndices>(i), search_string);
-      }
-    }
-    UNIMPLEMENTED();
-    return false;
-  } else {
-    ASSERT(method_ == kCpuInfoSystem);
-    return ProcCpuInfo::FieldContains(field, search_string);
-  }
-}
-
-
 const char* CpuInfo::ExtractField(CpuInfoIndices idx) {
   if (method_ == kCpuInfoCpuId) {
     return CpuId::field(idx);
   } else {
     ASSERT(method_ == kCpuInfoSystem);
     return ProcCpuInfo::ExtractField(FieldName(idx));
   }
 }
 
 
-const char* CpuInfo::ExtractFieldByString(const char* field) {
-  if (method_ == kCpuInfoCpuId) {
-    for (int i = 0; i < kCpuInfoMax; i++) {
-      if (strcmp(field, fields_[i]) == 0) {
-        return ExtractField(static_cast<CpuInfoIndices>(i));
-      }
-    }
-    UNIMPLEMENTED();
-    return NULL;
-  } else {
-    ASSERT(method_ == kCpuInfoSystem);
-    return ProcCpuInfo::ExtractField(field);
-  }
-}
-
-
 bool CpuInfo::HasField(const char* field) {
   if (method_ == kCpuInfoCpuId) {
     return (strcmp(field, fields_[kCpuInfoProcessor]) == 0) ||
            (strcmp(field, fields_[kCpuInfoModel]) == 0) ||
            (strcmp(field, fields_[kCpuInfoHardware]) == 0) ||
            (strcmp(field, fields_[kCpuInfoFeatures]) == 0);
   } else {
     ASSERT(method_ == kCpuInfoSystem);
     return ProcCpuInfo::HasField(field);
   }
 }
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)