Rename Encoding namepsace to encoding

https://google.github.io/styleguide/cppguide.html#Namespace_Names
> Namespace names are all lower-case.

This CL has no behavior changes.

Bug: 889726
Change-Id: Ia60a35c3a34147d84d366fad26e6a75f4859b015
Reviewed-on: https://chromium-review.googlesource.com/c/1286099Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#600677}

third_party/blink/renderer/modules/encoding/encoding.cc

@@ -6,7 +6,7 @@
 
 namespace blink {
 
-namespace Encoding {
+namespace encoding {
 
 bool IsASCIIWhiteSpace(UChar c) {
   // From Encoding Standard:
@@ -15,6 +15,6 @@ bool IsASCIIWhiteSpace(UChar c) {
   return c == 0x09 || c == 0x0A || c == 0x0C || c == 0x0D || c == 0x20;
 }
 
-}  // namespace Encoding
+}  // namespace encoding
 
 }  // namespace blink

third_party/blink/renderer/modules/encoding/encoding.h

@@ -9,13 +9,13 @@
 
 namespace blink {
 
-namespace Encoding {
+namespace encoding {
 
 // The Encoding Standard has a definition of whitespace that differs from
 // WTF::isWhiteSpace() (it excludes vertical tab).
 bool IsASCIIWhiteSpace(UChar);
 
-}  // namespace Encoding
+}  // namespace encoding
 
 }  // namespace blink
 

third_party/blink/renderer/modules/encoding/text_decoder.cc

@@ -43,7 +43,7 @@ TextDecoder* TextDecoder::Create(const String& label,
                                  const TextDecoderOptions& options,
                                  ExceptionState& exception_state) {
   WTF::TextEncoding encoding(
-      label.StripWhiteSpace(&Encoding::IsASCIIWhiteSpace));
+      label.StripWhiteSpace(&encoding::IsASCIIWhiteSpace));
   // The replacement encoding is not valid, but the Encoding API also
   // rejects aliases of the replacement encoding.
   if (!encoding.IsValid() || !strcasecmp(encoding.GetName(), "replacement")) {

third_party/blink/renderer/modules/encoding/text_decoder_stream.cc

@@ -147,7 +147,7 @@ TextDecoderStream* TextDecoderStream::Create(ScriptState* script_state,
                                              const TextDecoderOptions& options,
                                              ExceptionState& exception_state) {
   WTF::TextEncoding encoding(
-      label.StripWhiteSpace(&Encoding::IsASCIIWhiteSpace));
+      label.StripWhiteSpace(&encoding::IsASCIIWhiteSpace));
   // The replacement encoding is not valid, but the Encoding API also
   // rejects aliases of the replacement encoding.
   if (!encoding.IsValid() ||

third_party/blink/tools/blinkpy/presubmit/audit_non_blink_usage.py

@@ -217,6 +217,7 @@ _CONFIG = [
 
             # Nested namespaces under the blink namespace
             'cssvalue::.+',
+            'encoding::.+',
             'event_handling_util::.+',
             'scheduler::.+',
             'touch_action_util::.+',