Rename TypeManager to Manager.

With the move to the type:: hierarchy rename type::TypeManager to
type::Manager.

Bug: tint:1718
Change-Id: I1c8e2c2e469e20b959676232e9f3d62c9b3a789e
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/113429
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Dan Sinclair <dsinclair@chromium.org>

src/tint/program.h

diff --git a/src/tint/program.h b/src/tint/program.h
index 025db67..2b10f3b 100644
--- a/src/tint/program.h
+++ b/src/tint/program.h
@@ -23,7 +23,7 @@
 #include "src/tint/sem/constant.h"
 #include "src/tint/sem/info.h"
 #include "src/tint/symbol_table.h"
-#include "src/tint/type/type_manager.h"
+#include "src/tint/type/manager.h"
 
 // Forward Declarations
 namespace tint {
@@ -73,7 +73,7 @@
     ast::NodeID HighestASTNodeID() const { return highest_node_id_; }
 
     /// @returns a reference to the program's types
-    const type::TypeManager& Types() const {
+    const type::Manager& Types() const {
         AssertNotMoved();
         return types_;
     }
@@ -180,7 +180,7 @@
 
     ProgramID id_;
     ast::NodeID highest_node_id_;
-    type::TypeManager types_;
+    type::Manager types_;
     ASTNodeAllocator ast_nodes_;
     SemNodeAllocator sem_nodes_;
     ConstantAllocator constant_nodes_;