build: Fix chrome ODR violations

Both proto2json and tracing depend on common sources (e.g. perfetto
base), which causes ODR violations in chrome. Fix by merging the two
targets.

Bug: chromium:1024267
TBR: skyostil@google.com
Change-Id: Icffd68404e1edc9f580cc819013adb67d851ab67
diff --git a/BUILD.gn b/BUILD.gn
index 965d68e..e912a12 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -211,12 +211,16 @@
   component("libperfetto") {
     public_configs = [ "gn:public_config" ]
     deps = [
+      "src/trace_processor:export_json",
+      "src/trace_processor:storage",
       "src/tracing",
     ]
     configs -= [ "//build/config/compiler:chromium_code" ]
     configs += [ "//build/config/compiler:no_chromium_code" ]
     public_deps = [
+      "include/perfetto/ext/trace_processor:export_json",
       "include/perfetto/ext/tracing/core",
+      "include/perfetto/trace_processor:storage",
       "protos/perfetto/common:zero",
       "protos/perfetto/trace:zero",
       "protos/perfetto/trace/chrome:zero",
@@ -238,17 +242,4 @@
       ]
     }
   }
-  component("libproto_to_json") {
-    public_configs = [ "gn:public_config" ]
-    deps = [
-      "src/trace_processor:export_json",
-      "src/trace_processor:storage",
-    ]
-    configs -= [ "//build/config/compiler:chromium_code" ]
-    configs += [ "//build/config/compiler:no_chromium_code" ]
-    public_deps = [
-      "include/perfetto/ext/trace_processor:export_json",
-      "include/perfetto/trace_processor:storage",
-    ]
-  }
 }