Remove using directives ("using namespace x") in content/.

It made sense to just remove the dwrite namespaces since these headers are
only included in the other dwrite files (and will only ever be), and standard
Chromium namespace usage is "just one namespace per top-level module" anyway.

Bug: 82078
Change-Id: I9f5808da274d649cbfc8fabdf94980caf1de6edd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1815667Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698610}

content/browser/devtools/inspector_fuzzer.cc

@@ -12,22 +12,20 @@
 
 // Entry point for LibFuzzer.
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
-  using namespace inspector_protocol_encoding;
-
   if (size > 64 * 1024) {
     return 0;
   }
 
-  span<uint8_t> fuzz{data, size};
+  inspector_protocol_encoding::span<uint8_t> fuzz{data, size};
 
   // We need to handle whatever the parser parses. So, we handle the parsed
   // stuff with another CBOR encoder, just because it's conveniently available.
   std::vector<uint8_t> encoded;
-  Status status;
-  std::unique_ptr<StreamingParserHandler> encoder =
-      cbor::NewCBOREncoder(&encoded, &status);
+  inspector_protocol_encoding::Status status;
+  std::unique_ptr<inspector_protocol_encoding::StreamingParserHandler> encoder =
+      inspector_protocol_encoding::cbor::NewCBOREncoder(&encoded, &status);
 
-  cbor::ParseCBOR(fuzz, encoder.get());
+  inspector_protocol_encoding::cbor::ParseCBOR(fuzz, encoder.get());
 
   return 0;
 }

content/browser/native_file_system/native_file_system_file_writer_impl_unittest.cc

@@ -419,7 +419,7 @@ TEST_P(NativeFileSystemFileWriterImplWriteTest, WriteWithOffsetPastFile) {
   result = CloseSync();
   EXPECT_EQ(result, NativeFileSystemStatus::kOk);
 
-  using namespace std::string_literals;
+  using std::string_literals::operator""s;
   EXPECT_EQ("\0\0\0\0abc"s, ReadFile(test_file_url_));
 }
 

content/browser/renderer_host/dwrite_font_file_util_win.cc

@@ -17,10 +17,6 @@
 
 namespace content {
 
-using namespace dwrite_font_uma_logging;
-
-namespace dwrite_font_file_util {
-
 bool FontFilePathAndTtcIndex(IDWriteFont* font,
                              base::string16& file_path,
                              uint32_t& ttc_index) {
@@ -178,5 +174,4 @@ base::string16 GetWindowsFontsPath() {
   return base::i18n::FoldCase(font_path_chars.data());
 }
 
-}  // namespace dwrite_font_file_util
 }  // namespace content

content/browser/renderer_host/dwrite_font_file_util_win.h

@@ -15,8 +15,6 @@
 
 namespace content {
 
-namespace dwrite_font_file_util {
-
 bool FontFilePathAndTtcIndex(IDWriteFontFace* font,
                              base::string16& file_path,
                              uint32_t& ttc_index);
@@ -31,8 +29,6 @@ bool AddFilesForFont(IDWriteFont* font,
 
 base::string16 GetWindowsFontsPath();
 
-}  // namespace dwrite_font_file_util
-
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_DWRITE_FONT_FILE_UTIL_WIN_H_

content/browser/renderer_host/dwrite_font_lookup_table_builder_win.cc

@@ -40,9 +40,6 @@
 
 namespace content {
 
-using namespace dwrite_font_file_util;
-using namespace dwrite_font_uma_logging;
-
 namespace {
 
 const base::FilePath::CharType kProtobufFilename[] =

content/browser/renderer_host/dwrite_font_proxy_impl_win.cc

@@ -43,9 +43,6 @@ namespace mswr = Microsoft::WRL;
 
 namespace content {
 
-using namespace dwrite_font_uma_logging;
-using namespace dwrite_font_file_util;
-
 namespace {
 
 // These are the fonts that Blink tries to load in getLastResortFallbackFont,

content/browser/renderer_host/dwrite_font_uma_logging_win.cc

@@ -8,7 +8,6 @@
 #include "base/metrics/histogram_macros.h"
 
 namespace content {
-namespace dwrite_font_uma_logging {
 
 void LogLoaderType(DirectWriteFontLoaderType loader_type) {
   UMA_HISTOGRAM_ENUMERATION("DirectWrite.Fonts.Proxy.LoaderType", loader_type);
@@ -29,5 +28,4 @@ void LogMessageFilterError(MessageFilterError error) {
                             error);
 }
 
-}  // namespace dwrite_font_uma_logging
 }  // namespace content

content/browser/renderer_host/dwrite_font_uma_logging_win.h

@@ -7,8 +7,6 @@
 
 namespace content {
 
-namespace dwrite_font_uma_logging {
-
 // This enum is used to define the buckets for an enumerated UMA histogram.
 // Hence,
 //   (a) existing enumerated constants should never be deleted or reordered, and
@@ -53,7 +51,6 @@ void LogLastResortFontFileCount(size_t count);
 
 void LogMessageFilterError(MessageFilterError error);
 
-}  // namespace dwrite_font_uma_logging
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_DWRITE_FONT_UMA_LOGGING_WIN_H_

content/test/navigation_simulator_unittest.cc

@@ -293,7 +293,7 @@ TEST_P(NavigationSimulatorTestCancelFail, Fail) {
 TEST_P(NavigationSimulatorTestCancelFail, FailWithResponseHeaders) {
   simulator_->Start();
 
-  using namespace std::string_literals;
+  using std::string_literals::operator""s;
   std::string header =
       "HTTP/1.1 404 Not Found\0"
       "content-encoding: gzip\0\0"s;