Consistent formatting for Dawn/Tint.

This CL updates the clang format files to have a single shared format
between Dawn and Tint. The major changes are tabs are 4 spaces, lines
are 100 columns and namespaces are not indented.

Bug: dawn:1339
Change-Id: I4208742c95643998d9fd14e77a9cc558071ded39
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/87603
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
diff --git a/src/tint/ast/group_attribute.h b/src/tint/ast/group_attribute.h
index de7015b..a559461 100644
--- a/src/tint/ast/group_attribute.h
+++ b/src/tint/ast/group_attribute.h
@@ -23,25 +23,25 @@
 
 /// A group attribute
 class GroupAttribute final : public Castable<GroupAttribute, Attribute> {
- public:
-  /// constructor
-  /// @param pid the identifier of the program that owns this node
-  /// @param src the source of this node
-  /// @param value the group value
-  GroupAttribute(ProgramID pid, const Source& src, uint32_t value);
-  ~GroupAttribute() override;
+  public:
+    /// constructor
+    /// @param pid the identifier of the program that owns this node
+    /// @param src the source of this node
+    /// @param value the group value
+    GroupAttribute(ProgramID pid, const Source& src, uint32_t value);
+    ~GroupAttribute() override;
 
-  /// @returns the WGSL name for the attribute
-  std::string Name() const override;
+    /// @returns the WGSL name for the attribute
+    std::string Name() const override;
 
-  /// Clones this node and all transitive child nodes using the `CloneContext`
-  /// `ctx`.
-  /// @param ctx the clone context
-  /// @return the newly cloned node
-  const GroupAttribute* Clone(CloneContext* ctx) const override;
+    /// Clones this node and all transitive child nodes using the `CloneContext`
+    /// `ctx`.
+    /// @param ctx the clone context
+    /// @return the newly cloned node
+    const GroupAttribute* Clone(CloneContext* ctx) const override;
 
-  /// The group value
-  const uint32_t value;
+    /// The group value
+    const uint32_t value;
 };
 
 }  // namespace tint::ast