[clang-tidy] Cleaning namespaces to be more consistant across checkers.

Summary:
The goal of the patch is to bring checkers in their appropriate namespace.
This path doesn't change any behavior.

Reviewers: alexfh

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D19811

llvm-svn: 268264
diff --git a/clang-tools-extra/clang-tidy/misc/UnusedParametersCheck.cpp b/clang-tools-extra/clang-tidy/misc/UnusedParametersCheck.cpp
index b2504d4..6131132 100644
--- a/clang-tools-extra/clang-tidy/misc/UnusedParametersCheck.cpp
+++ b/clang-tools-extra/clang-tidy/misc/UnusedParametersCheck.cpp
@@ -16,6 +16,8 @@
 
 namespace clang {
 namespace tidy {
+namespace misc {
+
 namespace {
 bool isOverrideMethod(const FunctionDecl *Function) {
   if (const auto *MD = dyn_cast<CXXMethodDecl>(Function))
@@ -120,5 +122,6 @@
   }
 }
 
+} // namespace misc
 } // namespace tidy
 } // namespace clang