Clean up a few unused globals.

ppapi/native_client/src/trusted/plugin/plugin.cc

Index: ppapi/native_client/src/trusted/plugin/plugin.cc
diff --git a/ppapi/native_client/src/trusted/plugin/plugin.cc b/ppapi/native_client/src/trusted/plugin/plugin.cc
index 2aa90bedb4e0fda50ca32d530d3998539cb7cb35..8fb4c43c11835a4e610f796b784c8bc5a95d73fd 100644
--- a/ppapi/native_client/src/trusted/plugin/plugin.cc
+++ b/ppapi/native_client/src/trusted/plugin/plugin.cc
@@ -92,9 +92,6 @@ const char* const kDevAttribute = "@dev";
 const char* const kChromeExtensionUriScheme = "chrome-extension";
 const char* const kDataUriScheme = "data";
 
-// The key used to find the dictionary nexe URLs in the manifest file.
-const char* const kNexesKey = "nexes";
-
 // Up to 20 seconds
 const int64_t kTimeSmallMin = 1;         // in ms
 const int64_t kTimeSmallMax = 20000;     // in ms
@@ -263,8 +260,6 @@ void HistogramHTTPStatusCode(const std::string& name, int status) {
 
 }  // namespace
 
-static int const kAbiHeaderBuffer = 256;  // must be at least EI_ABIVERSION + 1
-
 void Plugin::AddPropertyGet(const nacl::string& prop_name,
                             Plugin::PropertyGetter getter) {
   PLUGIN_PRINTF(("Plugin::AddPropertyGet (prop_name='%s')\n",