Add missing (and remove superfluous) 'explicit' from constructors.

skia/ext/SkFontHost_fontconfig.cpp

 /* libs/graphics/ports/SkFontHost_fontconfig.cpp
 **
 ** Copyright 2008, Google Inc.
 **
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 **
 **     http://www.apache.org/licenses/LICENSE-2.0
 **
@@ skipping 241 matching lines @@
     stream->skip(size);
 
     return SkFontHost::CreateTypeface(NULL, desc.getFamilyName(),
                                       desc.getStyle());
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 class SkFileDescriptorStream : public SkStream {
   public:
-    SkFileDescriptorStream(int fd) {
+    explicit SkFileDescriptorStream(int fd) {
         memory_ = NULL;
         offset_ = 0;
 
         // this ensures that if we fail in the constructor, we will safely
         // ignore all subsequent calls to read() because we will always trim
         // the requested size down to 0
         length_ = 0;
 
         struct stat st;
         if (fstat(fd, &st))
@@ skipping 87 matching lines @@
         if (!path)
           return 1;
     }
 
     if (path)
         SkASSERT(!"SkFontHost::GetFileName does not support the font path "
                   "retrieval.");
 
     return 0;
 }