Update from https://crrev.com/327068

tools/clang/plugins/ChromeClassTester.cpp

Index: tools/clang/plugins/ChromeClassTester.cpp
diff --git a/tools/clang/plugins/ChromeClassTester.cpp b/tools/clang/plugins/ChromeClassTester.cpp
index 48d6a735f272c3db2331e7f21703fedaa265e0a2..931da02f3ff54e352a1cbec4337433abb38e449f 100644
--- a/tools/clang/plugins/ChromeClassTester.cpp
+++ b/tools/clang/plugins/ChromeClassTester.cpp
@@ -7,26 +7,20 @@
 
 #include "ChromeClassTester.h"
 
-#include <sys/param.h>
+#include <algorithm>
 
 #include "clang/AST/AST.h"
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/SourceManager.h"
 
+#ifdef LLVM_ON_UNIX
+#include <sys/param.h>
+#endif
+
 using namespace clang;
 
 namespace {
 
-bool starts_with(const std::string& one, const std::string& two) {
-  return one.compare(0, two.size(), two) == 0;
-}
-
-std::string lstrip(const std::string& one, const std::string& two) {
-  if (starts_with(one, two))
-    return one.substr(two.size());
-  return one;
-}
-
 bool ends_with(const std::string& one, const std::string& two) {
   if (two.size() > one.size())
     return false;
@@ -101,14 +95,67 @@ void ChromeClassTester::emitWarning(SourceLocation loc,
   std::string err;
   err = "[chromium-style] ";
   err += raw_error;
+  // TODO(dcheng): Re-enable -Werror for these diagnostics on Windows once all
+  // the pre-existing warnings are cleaned up. https://crbug.com/467287
   DiagnosticIDs::Level level =
+#if !defined(LLVM_ON_WIN32)
       diagnostic().getWarningsAsErrors() ?
       DiagnosticIDs::Error :
+#endif
       DiagnosticIDs::Warning;
   unsigned id = diagnostic().getDiagnosticIDs()->getCustomDiagID(level, err);
   DiagnosticBuilder builder = diagnostic().Report(full, id);
 }
 
+bool ChromeClassTester::InBannedDirectory(SourceLocation loc) {
+  if (instance().getSourceManager().isInSystemHeader(loc))
+    return true;
+
+  std::string filename;
+  if (!GetFilename(loc, &filename)) {
+    // If the filename cannot be determined, simply treat this as a banned
+    // location, instead of going through the full lookup process.
+    return true;
+  }
+
+  // We need to special case scratch space; which is where clang does its
+  // macro expansion. We explicitly want to allow people to do otherwise bad
+  // things through macros that were defined due to third party libraries.
+  if (filename == "<scratch space>")
+    return true;
+
+  // Don't complain about autogenerated protobuf files.
+  if (ends_with(filename, ".pb.h")) {
+    return true;
+  }
+
+#if defined(LLVM_ON_UNIX)
+  // We need to munge the paths so that they are relative to the repository
+  // srcroot. We first resolve the symlinktastic relative path and then
+  // remove our known srcroot from it if needed.
+  char resolvedPath[MAXPATHLEN];
+  if (realpath(filename.c_str(), resolvedPath)) {
+    filename = resolvedPath;
+  }
+#endif
+
+#if defined(LLVM_ON_WIN32)
+  std::replace(filename.begin(), filename.end(), '\\', '/');
+#endif
+
+  for (const std::string& banned_dir : banned_directories_) {
+    // If any of the banned directories occur as a component in filename,
+    // this file is rejected.
+    assert(banned_dir.front() == '/' && "Banned dir must start with '/'");
+    assert(banned_dir.back() == '/' && "Banned dir must end with '/'");
+
+    if (filename.find(banned_dir) != std::string::npos)
+      return true;
+  }
+
+  return false;
+}
+
 bool ChromeClassTester::InBannedNamespace(const Decl* record) {
   std::string n = GetNamespace(record);
   if (!n.empty()) {
@@ -239,47 +286,6 @@ std::string ChromeClassTester::GetNamespaceImpl(const DeclContext* context,
   }
 }
 
-bool ChromeClassTester::InBannedDirectory(SourceLocation loc) {
-  std::string filename;
-  if (!GetFilename(loc, &filename)) {
-    // If the filename cannot be determined, simply treat this as a banned
-    // location, instead of going through the full lookup process.
-    return true;
-  }
-
-  // We need to special case scratch space; which is where clang does its
-  // macro expansion. We explicitly want to allow people to do otherwise bad
-  // things through macros that were defined due to third party libraries.
-  if (filename == "<scratch space>")
-    return true;
-
-  // Don't complain about autogenerated protobuf files.
-  if (ends_with(filename, ".pb.h")) {
-    return true;
-  }
-
-  // We need to munge the paths so that they are relative to the repository
-  // srcroot. We first resolve the symlinktastic relative path and then
-  // remove our known srcroot from it if needed.
-  char resolvedPath[MAXPATHLEN];
-  if (realpath(filename.c_str(), resolvedPath)) {
-    filename = resolvedPath;
-  }
-
-  for (size_t i = 0; i < banned_directories_.size(); ++i) {
-    // If any of the banned directories occur as a component in filename,
-    // this file is rejected.
-    const std::string& banned_dir = banned_directories_[i];
-    assert(banned_dir.front() == '/' && "Banned dir must start with '/'");
-    assert(banned_dir.back() == '/' && "Banned dir must end with '/'");
-
-    if (filename.find(banned_dir) != std::string::npos)
-      return true;
-  }
-
-  return false;
-}
-
 bool ChromeClassTester::IsIgnoredType(const std::string& base_name) {
   return ignored_record_names_.find(base_name) != ignored_record_names_.end();
 }