[llvm-cov] Use the coverage namespace. NFC.

This is a simple code cleanup. It will facilitate moving
LineCoverageIterator to libCoverage.

llvm-svn: 316140
diff --git a/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp b/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp
index 4900ad4..e839184 100644
--- a/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp
+++ b/llvm/tools/llvm-cov/SourceCoverageViewHTML.cpp
@@ -365,8 +365,7 @@
 }
 
 Error CoveragePrinterHTML::createIndexFile(
-    ArrayRef<std::string> SourceFiles,
-    const coverage::CoverageMapping &Coverage,
+    ArrayRef<std::string> SourceFiles, const CoverageMapping &Coverage,
     const CoverageFiltersMatchAll &Filters) {
   // Emit the default stylesheet.
   auto CSSOrErr = createOutputStream("style", "css", /*InToplevel=*/true);
@@ -515,7 +514,7 @@
     return tag("span", Snippet, Color.getValue());
   };
 
-  auto CheckIfUncovered = [](const coverage::CoverageSegment *S) {
+  auto CheckIfUncovered = [](const CoverageSegment *S) {
     return S && S->HasCount && S->Count == 0;
   };