Fix presubmit error.

No idea why they suddenly started to appear.

TBR=machenbach@chromium.org

Review URL: https://codereview.chromium.org/458743005

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23061 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/objects.h

@@ -7541,7 +7541,7 @@ class SharedFunctionInfo: public HeapObject {
 
 // Printing support.
 struct SourceCodeOf {
-  SourceCodeOf(SharedFunctionInfo* v, int max = -1)
+  explicit SourceCodeOf(SharedFunctionInfo* v, int max = -1)
       : value(v), max_length(max) {}
   const SharedFunctionInfo* value;
   int max_length;
@@ -9745,7 +9745,8 @@ class ConsStringNullOp {
 class ConsStringIteratorOp {
  public:
   inline ConsStringIteratorOp() {}
-  inline ConsStringIteratorOp(ConsString* cons_string, int offset = 0) {
+  inline explicit ConsStringIteratorOp(ConsString* cons_string,
+                                       int offset = 0) {
     Reset(cons_string, offset);
   }
   inline void Reset(ConsString* cons_string, int offset = 0) {