tint/ast: Remove unnecessary ast:: prefixes

These uses are already in the ast namespace, so do not need the extra qualification.

Change-Id: I5e66048c9485c55b72e61ffa5b85b17ba1c780d0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/120761
Kokoro: Kokoro <noreply+kokoro@google.com>
Reviewed-by: Dan Sinclair <dsinclair@chromium.org>
Commit-Queue: Ben Clayton <bclayton@google.com>
Commit-Queue: Ben Clayton <bclayton@chromium.org>
diff --git a/src/tint/ast/builtin_texture_helper_test.h b/src/tint/ast/builtin_texture_helper_test.h
index 609928a..8bcb1a9f 100644
--- a/src/tint/ast/builtin_texture_helper_test.h
+++ b/src/tint/ast/builtin_texture_helper_test.h
@@ -185,8 +185,8 @@
 
 /// Describes a texture builtin overload
 struct TextureOverloadCase {
-    /// Args is a list of ast::Expression used as arguments to the texture overload case.
-    using Args = utils::Vector<const ast::Expression*, 8>;
+    /// Args is a list of Expression used as arguments to the texture overload case.
+    using Args = utils::Vector<const Expression*, 8>;
 
     /// Constructor for textureSample...() functions
     TextureOverloadCase(ValidTextureOverload,
@@ -225,15 +225,15 @@
 
     /// @param builder the AST builder used for the test
     /// @returns the vector component type of the texture function return value
-    ast::Type BuildResultVectorComponentType(ProgramBuilder* builder) const;
+    Type BuildResultVectorComponentType(ProgramBuilder* builder) const;
     /// @param builder the AST builder used for the test
     /// @returns a variable holding the test texture, automatically registered as
     /// a global variable.
-    const ast::Variable* BuildTextureVariable(ProgramBuilder* builder) const;
+    const Variable* BuildTextureVariable(ProgramBuilder* builder) const;
     /// @param builder the AST builder used for the test
     /// @returns a Variable holding the test sampler, automatically registered as
     /// a global variable.
-    const ast::Variable* BuildSamplerVariable(ProgramBuilder* builder) const;
+    const Variable* BuildSamplerVariable(ProgramBuilder* builder) const;
 
     /// The enumerator for this overload
     const ValidTextureOverload overload;