Bug 1045068 - Fix some bad implicit constructors in Gecko profiler; r=BenWa

tools/profiler/GeckoProfiler.h

@@ -200,7 +200,7 @@ static inline bool profiler_in_privacy_mode() { return false; }
 
 class GeckoProfilerInitRAII {
 public:
-  GeckoProfilerInitRAII(void* stackTop) {
+  explicit GeckoProfilerInitRAII(void* stackTop) {
     profiler_init(stackTop);
   }
   ~GeckoProfilerInitRAII() {

tools/profiler/PseudoStack.h

@@ -96,7 +96,7 @@ class ThreadProfile;
 class ProfilerMarker {
   friend class ProfilerLinkedList<ProfilerMarker>;
 public:
-  ProfilerMarker(const char* aMarkerName,
+  explicit ProfilerMarker(const char* aMarkerName,
          ProfilerMarkerPayload* aPayload = nullptr,
          float aTime = 0);