Bug 1373436 (part 2) - Use a UniquePtr for CorePS::mLul. r=mstange.

tools/profiler/core/platform-linux-android.cpp

@@ -259,9 +259,9 @@ Sampler::Sampler(PSLockRef aLock)
   bool createdLUL = false;
   lul::LUL* lul = CorePS::Lul(aLock);
   if (!lul) {
-    lul = new lul::LUL(logging_sink_for_LUL);
-    CorePS::SetLul(aLock, lul);
+    CorePS::SetLul(aLock, MakeUnique<lul::LUL>(logging_sink_for_LUL));
     // Read all the unwind info currently available.
+    lul = CorePS::Lul(aLock);
     read_procmaps(lul);
     createdLUL = true;
   }

tools/profiler/core/platform.cpp

@@ -185,10 +185,6 @@ private:
       delete mDeadThreads.back();
       mDeadThreads.pop_back();
     }
-
-#if defined(USE_LUL_STACKWALK)
-    delete mLul;
-#endif
   }
 
 public:
@@ -243,7 +239,11 @@ public:
   PS_GET(ThreadVector&, DeadThreads)
 
 #ifdef USE_LUL_STACKWALK
-  PS_GET_AND_SET(lul::LUL*, Lul)
+  static lul::LUL* Lul(PSLockRef) { return sInstance->mLul.get(); }
+  static void SetLul(PSLockRef, UniquePtr<lul::LUL> aLul)
+  {
+    sInstance->mLul = Move(aLul);
+  }
 #endif
 
 private:
@@ -263,7 +263,7 @@ private:
 
 #ifdef USE_LUL_STACKWALK
   // LUL's state. Null prior to the first activation, non-null thereafter.
-  lul::LUL* mLul;
+  UniquePtr<lul::LUL> mLul;
 #endif
 };