Fix "unreachable code" warnings (MSVC warning 4702) in content/.

content/browser/indexed_db/indexed_db_leveldb_coding.cc

Index: content/browser/indexed_db/indexed_db_leveldb_coding.cc
===================================================================
--- content/browser/indexed_db/indexed_db_leveldb_coding.cc	(revision 256983)
+++ content/browser/indexed_db/indexed_db_leveldb_coding.cc	(working copy)
@@ -293,14 +293,6 @@
   size_t previous_size = into->size();
   DCHECK(value.IsValid());
   switch (value.type()) {
-    case WebIDBKeyTypeNull:
-    case WebIDBKeyTypeInvalid:
-    case WebIDBKeyTypeMin:
-    default: {
-      NOTREACHED();
-      EncodeByte(kIndexedDBKeyNullTypeByte, into);
-      return;
-    }
     case WebIDBKeyTypeArray: {
       EncodeByte(kIndexedDBKeyArrayTypeByte, into);
       size_t length = value.array().size();
@@ -310,33 +302,39 @@
       DCHECK_GT(into->size(), previous_size);
       return;
     }
-    case WebIDBKeyTypeBinary: {
+
+    case WebIDBKeyTypeBinary:
       EncodeByte(kIndexedDBKeyBinaryTypeByte, into);
       EncodeBinary(value.binary(), into);
       DCHECK_GT(into->size(), previous_size);
       return;
-    }
-    case WebIDBKeyTypeString: {
+
+    case WebIDBKeyTypeString:
       EncodeByte(kIndexedDBKeyStringTypeByte, into);
       EncodeStringWithLength(value.string(), into);
       DCHECK_GT(into->size(), previous_size);
       return;
-    }
-    case WebIDBKeyTypeDate: {
+
+    case WebIDBKeyTypeDate:
       EncodeByte(kIndexedDBKeyDateTypeByte, into);
       EncodeDouble(value.date(), into);
       DCHECK_EQ(9u, static_cast<size_t>(into->size() - previous_size));
       return;
-    }
-    case WebIDBKeyTypeNumber: {
+
+    case WebIDBKeyTypeNumber:
       EncodeByte(kIndexedDBKeyNumberTypeByte, into);
       EncodeDouble(value.number(), into);
       DCHECK_EQ(9u, static_cast<size_t>(into->size() - previous_size));
       return;
-    }
+
+    case WebIDBKeyTypeNull:
+    case WebIDBKeyTypeInvalid:
+    case WebIDBKeyTypeMin:
+    default:
+      NOTREACHED();
+      EncodeByte(kIndexedDBKeyNullTypeByte, into);
+      return;
   }
-
-  NOTREACHED();
 }
 
 void EncodeIDBKeyPath(const IndexedDBKeyPath& value, std::string* into) {