Fix typos (#8339)

Courtesy of google's "CommonTypos" analysis.

lib/ui/semantics/semantics_node.cc

@@ -8,7 +8,7 @@
 
 namespace blink {
 
-constexpr int32_t kMinPlatfromViewId = -1;
+constexpr int32_t kMinPlatformViewId = -1;
 
 SemanticsNode::SemanticsNode() = default;
 
@@ -25,7 +25,7 @@ bool SemanticsNode::HasFlag(SemanticsFlags flag) {
 }
 
 bool SemanticsNode::IsPlatformViewNode() const {
-  return platformViewId > kMinPlatfromViewId;
+  return platformViewId > kMinPlatformViewId;
 }
 
 }  // namespace blink

lib/ui/semantics/semantics_node.h

@@ -81,7 +81,7 @@ struct SemanticsNode {
   bool HasAction(SemanticsAction action);
   bool HasFlag(SemanticsFlags flag);
 
-  // Whether this node is for embeded platform views.
+  // Whether this node is for embedded platform views.
   bool IsPlatformViewNode() const;
 
   int32_t id = 0;