[NaCl SDK] Update sdk_tools to 160493->174973. Also added script to make updating sdk_tools easier.

native_client_sdk/src/build_tools/json/naclsdk_manifest2.json

 {
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-      "description": "Native Client SDK Tools, revision 160493",
-      "stability": "stable",
-      "recommended": "yes",
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-      "revision": 160493
-    },
-    {
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-      "description": "gdb (Gnu Debugger) build for debugging x86-64 binary from win64 host",
-      "stability": "beta",
-      "recommended": "no",
-      "version": 0,
-      "archives": [
-        {
-          "url": "https://commondatastorage.googleapis.com/nativeclient-mirror/nacl/nacl_sdk/gdb_builds/0.1/gdb-win-builds.tgz",
+      "name": "sdk_tools", 
+      "description": "Native Client SDK Tools, revision 174973", 
+      "stability": "stable", 
+      "recommended": "yes", 
+      "version": 1, 
+      "archives": [
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       "revision": 1
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+    }, 
+    {
+      "name": "vs_addin", 
+      "description": "Visual Studio Add-In for building and debugging NaCl applications", 
+      "stability": "dev", 
+      "recommended": "no", 
+      "version": 0, 
+      "repath": "vs_addin", 
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           "host_os": "win"
         }
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+    }, 
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+      "description": "Chrome 16 bundle, revision 1398", 
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+    }, 
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+      "description": "Chrome 17 bundle, revision 112997", 
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+      "recommended": "no", 
+      "version": 17, 
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+        }, 
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-      "description": "Chrome Canary",
-      "stability": "canary",
-      "recommended": "no",
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-      "repath": "",
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+      "repath": "pepper_23", 
+      "archives": [], 
+      "revision": 0
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+      "stability": "beta", 
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+      "repath": "pepper_24", 
+      "archives": [], 
+      "revision": 0
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+      "description": "Chrome 25 bundle, revision xxxxx", 
+      "stability": "dev", 
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+      "repath": "pepper_25", 
+      "archives": [], 
+      "revision": 0
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+      "description": "Chrome Canary", 
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+      "recommended": "no", 
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+      "repath": "", 
+      "archives": [], 
       "revision": 0
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-  ],
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   "manifest_version": 2
-}
+}