Add use-chromium-style-naming option to Blink GC plugin.

tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt

Index: tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt
diff --git a/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt b/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt
index 058fccb8c3192763fe0272c6d083ff1cc6b02327..5637daa1fdf1fec50272782032a038009021599d 100644
--- a/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt
+++ b/tools/clang/blink_gc_plugin/tests/trace_after_dispatch_impl_error.txt
@@ -1,31 +1,31 @@
 trace_after_dispatch_impl_error.cpp:10:1: warning: [blink-gc] Missing dispatch to class 'TraceAfterDispatchInlinedDerived' in manual trace dispatch.
-inline void TraceAfterDispatchInlinedBase::traceImpl(
+inline void TraceAfterDispatchInlinedBase::TraceImpl(
 ^
 trace_after_dispatch_impl_error.cpp:35:1: warning: [blink-gc] Missing dispatch to class 'TraceAfterDispatchExternDerived' in manual trace dispatch.
-inline void TraceAfterDispatchExternBase::traceImpl(VisitorDispatcher visitor) {
+inline void TraceAfterDispatchExternBase::TraceImpl(VisitorDispatcher visitor) {
 ^
 In file included from trace_after_dispatch_impl_error.cpp:5:
 ./trace_after_dispatch_impl_error.h:39:3: warning: [blink-gc] Class 'TraceAfterDispatchInlinedBase' has untraced fields that require tracing.
-  void traceAfterDispatchImpl(VisitorDispatcher visitor) {
+  void TraceAfterDispatchImpl(VisitorDispatcher visitor) {
   ^
 ./trace_after_dispatch_impl_error.h:44:3: note: [blink-gc] Untraced field 'x_base_' declared here:
   Member<X> x_base_;
   ^
 ./trace_after_dispatch_impl_error.h:58:3: warning: [blink-gc] Base class 'TraceAfterDispatchInlinedBase' of derived class 'TraceAfterDispatchInlinedDerived' requires tracing.
-  void traceAfterDispatchImpl(VisitorDispatcher visitor) {
+  void TraceAfterDispatchImpl(VisitorDispatcher visitor) {
   ^
 ./trace_after_dispatch_impl_error.h:58:3: warning: [blink-gc] Class 'TraceAfterDispatchInlinedDerived' has untraced fields that require tracing.
 ./trace_after_dispatch_impl_error.h:62:3: note: [blink-gc] Untraced field 'x_derived_' declared here:
   Member<X> x_derived_;
   ^
 trace_after_dispatch_impl_error.cpp:55:1: warning: [blink-gc] Class 'TraceAfterDispatchExternBase' has untraced fields that require tracing.
-inline void TraceAfterDispatchExternBase::traceAfterDispatchImpl(
+inline void TraceAfterDispatchExternBase::TraceAfterDispatchImpl(
 ^
 ./trace_after_dispatch_impl_error.h:84:3: note: [blink-gc] Untraced field 'x_base_' declared here:
   Member<X> x_base_;
   ^
 trace_after_dispatch_impl_error.cpp:70:1: warning: [blink-gc] Base class 'TraceAfterDispatchExternBase' of derived class 'TraceAfterDispatchExternDerived' requires tracing.
-inline void TraceAfterDispatchExternDerived::traceAfterDispatchImpl(
+inline void TraceAfterDispatchExternDerived::TraceAfterDispatchImpl(
 ^
 trace_after_dispatch_impl_error.cpp:70:1: warning: [blink-gc] Class 'TraceAfterDispatchExternDerived' has untraced fields that require tracing.
 ./trace_after_dispatch_impl_error.h:98:3: note: [blink-gc] Untraced field 'x_derived_' declared here: