Fix header include syntax. (#2882)

diff --git a/source/opt/function.cpp b/source/opt/function.cpp
index 2520052..efda68b 100644
--- a/source/opt/function.cpp
+++ b/source/opt/function.cpp
@@ -13,13 +13,14 @@
 // limitations under the License.
 
 #include "source/opt/function.h"
-#include "function.h"
-#include "ir_context.h"
 
-#include <source/util/bit_vector.h>
 #include <ostream>
 #include <sstream>
 
+#include "function.h"
+#include "ir_context.h"
+#include "source/util/bit_vector.h"
+
 namespace spvtools {
 namespace opt {
 
diff --git a/source/opt/optimizer.cpp b/source/opt/optimizer.cpp
index 1ad88c0..1e7df99 100644
--- a/source/opt/optimizer.cpp
+++ b/source/opt/optimizer.cpp
@@ -21,12 +21,12 @@
 #include <utility>
 #include <vector>
 
-#include <source/spirv_optimizer_options.h>
 #include "source/opt/build_module.h"
 #include "source/opt/graphics_robust_access_pass.h"
 #include "source/opt/log.h"
 #include "source/opt/pass_manager.h"
 #include "source/opt/passes.h"
+#include "source/spirv_optimizer_options.h"
 #include "source/util/make_unique.h"
 #include "source/util/string_utils.h"
 
diff --git a/tools/util/cli_consumer.h b/tools/util/cli_consumer.h
index ca3d91b..64a5e46 100644
--- a/tools/util/cli_consumer.h
+++ b/tools/util/cli_consumer.h
@@ -15,7 +15,7 @@
 #ifndef SOURCE_UTIL_CLI_CONSUMMER_H_
 #define SOURCE_UTIL_CLI_CONSUMMER_H_
 
-#include <include/spirv-tools/libspirv.h>
+#include "include/spirv-tools/libspirv.h"
 
 namespace spvtools {
 namespace utils {