Rename TouchActionUtil namepsace to touch_action_util

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: I897e124f0320106f49bc9f7f99533d7cfd0b125b
Reviewed-on: https://chromium-review.googlesource.com/c/1282644Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Zhuoyu Qian <zhuoyu.qian@samsung.com>
Cr-Commit-Position: refs/heads/master@{#599954}

third_party/blink/renderer/core/exported/web_view_impl.cc

@@ -2164,7 +2164,8 @@ bool WebViewImpl::ShouldZoomToLegibleScale(const Element& element) {
     // decide not to zoom in if the user won't be able to zoom out. e.g if the
     // textbox is within a touch-action: none container the user can't zoom
     // back out.
-    TouchAction action = TouchActionUtil::ComputeEffectiveTouchAction(element);
+    TouchAction action =
+        touch_action_util::ComputeEffectiveTouchAction(element);
     if (!(action & TouchAction::kTouchActionPinchZoom))
       zoom_into_legible_scale = false;
   }

third_party/blink/renderer/core/input/touch_action_util.cc

@@ -11,7 +11,7 @@
 #include "third_party/blink/renderer/core/layout/layout_object.h"
 
 namespace blink {
-namespace TouchActionUtil {
+namespace touch_action_util {
 
 TouchAction ComputeEffectiveTouchAction(const Node& node) {
   if (node.GetComputedStyle())
@@ -20,5 +20,5 @@ TouchAction ComputeEffectiveTouchAction(const Node& node) {
   return TouchAction::kTouchActionAuto;
 }
 
-}  // namespace TouchActionUtil
+}  // namespace touch_action_util
 }  // namespace blink

third_party/blink/renderer/core/input/touch_action_util.h

@@ -12,9 +12,9 @@ namespace blink {
 
 class Node;
 
-namespace TouchActionUtil {
+namespace touch_action_util {
 CORE_EXPORT TouchAction ComputeEffectiveTouchAction(const Node&);
-}  // namespace TouchActionUtil
+}  // namespace touch_action_util
 
 }  // namespace blink
 

third_party/blink/renderer/core/input/touch_event_manager.cc

@@ -572,7 +572,7 @@ void TouchEventManager::UpdateTouchAttributeMapsForPointerDown(
   attributes->region_ = region;
 
   TouchAction effective_touch_action =
-      TouchActionUtil::ComputeEffectiveTouchAction(*touch_node);
+      touch_action_util::ComputeEffectiveTouchAction(*touch_node);
 
   should_enforce_vertical_scroll_ =
       touch_sequence_document_->IsVerticalScrollEnforced();

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

@@ -218,6 +218,7 @@ _CONFIG = [
             # Nested namespaces under the blink namespace
             'cssvalue::.+',
             'scheduler::.+',
+            'touch_action_util::.+',
             'xpath::.+',
 
             # Third-party libraries that don't depend on non-Blink Chrome code