build error 1

[262/38419] CXX obj/base/base/trace_event_memory_overhead.o
FAILED: obj/base/base/trace_event_memory_overhead.o
../../third_party/llvm-build/Release+Asserts/bin/clang++ -MMD -MF obj/base/base/trace_event_memory_overhead.o.d -DUSE_SYMBOLIZE -DUSE_UDEV -DUSE_AURA=1 -DUSE_GLIB=1 -DUSE_NSS_CERTS=1 -DUSE_OZONE=1 -DOFFICIAL_BUILD -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -DNO_UNWIND_TABLES -D_GNU_SOURCE -DCR_CLANG_REVISION=\"n340759-eaabaf7e-1\" -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D_FORTIFY_SOURCE=2 -DNDEBUG -DNVALGRIND -DDYNAMIC_ANNOTATIONS_ENABLED=0 -DBASE_IMPLEMENTATION -DGLIB_VERSION_MAX_ALLOWED=GLIB_VERSION_2_40 -DGLIB_VERSION_MIN_REQUIRED=GLIB_VERSION_2_40 -I../.. -Igen -I../../third_party/boringssl/src/include -fprofile-sample-use=../../chrome/android/profiles/afdo.prof -fno-strict-aliasing --param=ssp-buffer-size=4 -fstack-protector -fno-unwind-tables -fno-asynchronous-unwind-tables -fPIC -pthread -fcolor-diagnostics -fmerge-all-constants -fcrash-diagnostics-dir=../../tools/clang/crashreports -Xclang -mllvm -Xclang -instcombine-lower-dbg-declare=0 -flto=thin -fsplit-lto-unit -fwhole-program-vtables -m64 -march=x86-64 -Xclang -fdebug-compilation-dir -Xclang . -no-canonical-prefixes -Wall -Wextra -Wimplicit-fallthrough -Wthread-safety -Wextra-semi -Wno-missing-field-initializers -Wno-unused-parameter -Wno-c++11-narrowing -Wno-unneeded-internal-declaration -Wno-undefined-var-template -Wno-ignored-pragma-optimize -Wno-implicit-int-float-conversion -Wno-final-dtor-non-final-class -Wno-bitwise-conditional-parentheses -Wno-builtin-assume-aligned-alignment -Wno-deprecated-copy -Wno-misleading-indentation -Wno-range-loop-analysis -fno-omit-frame-pointer -g1 -fsanitize=cfi-vcall -fsanitize-blacklist=../../tools/cfi/blacklist.txt -fsanitize=cfi-icall -fvisibility=hidden -Xclang -add-plugin -Xclang find-bad-constructs -Xclang -plugin-arg-find-bad-constructs -Xclang check-ipc -Wheader-hygiene -Wstring-conversion -Wtautological-overlap-compare -Wglobal-constructors -Wexit-time-destructors -Wshadow -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -Wexit-time-destructors -O2 -fno-ident -fdata-sections -ffunction-sections -std=c++14 -fno-exceptions -fno-rtti -fvisibility-inlines-hidden -c ../../base/trace_event/trace_event_memory_overhead.cc -o obj/base/base/trace_event_memory_overhead.o
In file included from ../../base/trace_event/trace_event_memory_overhead.cc:5:
../../base/trace_event/trace_event_memory_overhead.h:60:29: error: no type named 'string' in namespace 'std'
  void AddString(const std::string& str);
                       ~~~~~^
../../base/trace_event/trace_event_memory_overhead.cc:87:32: error: out-of-line definition of 'AddString' does not match any declaration in 'base::trace_event::TraceEventMemoryOverhead'
void TraceEventMemoryOverhead::AddString(const std::string& str) {
                               ^~~~~~~~~
2 errors generated.
[271/38419] CXX obj/base/base/trace_log.o
ninja: build stopped: subcommand failed.
==> ERROR: A failure occurred in build().
    Aborting...