linux: Chrome-side gyp changes for cross-compile

third_party/protobuf2/protobuf.gyp

Index: third_party/protobuf2/protobuf.gyp
diff --git a/third_party/protobuf2/protobuf.gyp b/third_party/protobuf2/protobuf.gyp
index 18fdcd4783ee967d7cb934237a3d08efec969f04..7b6d0db55476cea06dee8619f882f239e192244c 100644
--- a/third_party/protobuf2/protobuf.gyp
+++ b/third_party/protobuf2/protobuf.gyp
@@ -38,6 +38,7 @@
     {
       'target_name': 'protobuf_lite',
       'type': '<(library)',
+      'toolsets': ['host', 'target'],
       'sources': [
         'src/src/google/protobuf/stubs/common.h',
         'src/src/google/protobuf/stubs/once.h',
@@ -92,6 +93,7 @@
     {
       'target_name': 'protobuf',
       'type': '<(library)',
+      'toolsets': ['host'],
       'sources': [
         'src/src/google/protobuf/descriptor.h',
         'src/src/google/protobuf/descriptor.pb.h',
@@ -149,6 +151,7 @@
     {
       'target_name': 'protoc',
       'type': 'executable',
+      'toolsets': ['host'],
       'sources': [
         'src/src/google/protobuf/compiler/code_generator.cc',
         'src/src/google/protobuf/compiler/command_line_interface.cc',