[inspector] use own version of third_party/inspector_protocol

third_party/WebKit/Source/platform/inspector_protocol/sample_config.json

-{
-    "protocol": {
-        "path": "./relative/path/protocol/sample_protocol.json",
-        "package": "include/generated/files/like/this",
-        "output": "place/generated/files/here",
-        "namespace": ["sample_project", "protocol"],
-        "export_macro": "LIB_EXPORT",
-        "export_header": "lib/lib_export.h"
-    },
-
-    "exported": {
-        "package": "include/exported/files/like/this",
-        "output": "place/exported/files/here",
-        "string_header": "include/exported/string.h",
-        "string_in": "String",
-        "string_out": "String",
-        "to_string_out": "toString(%s)",
-        "export_macro": "LIB_EXPORT",
-        "export_header": "lib/lib_export.h"
-    },
-
-    "imported": {
-        "path": "../relative/path/imported_protocol.json",
-        "package": "either/include/imported/files/from/here",
-        "header": "or/include/them/all/together/like/this/imported_protocol.h",
-        "to_imported_string": "toImportedString(%s)",
-        "from_imported_string": "fromImportedString(%s)",
-        "namespace": ["imported_project", "protocol"]
-    },
-
-    "lib": {
-        "package": "include/lib/files/like/this",
-        "output": "place/generated/lib/files/here",
-        "string_header": "string/implementation.h",
-        "platform_header": "platform/implementation.h",
-        "export_macro": "LIB_EXPORT",
-        "export_header": "lib/lib_export.h"
-    }
-}