Use dynamic CRT in the Windows static library build.

Consequently, don't use the allocator shim.

patches/build_gn.patch

@@ -1,3 +1,15 @@
+diff --git a/base/allocator/BUILD.gn b/base/allocator/BUILD.gn
+index 8cdb06161f5c..285461d3381d 100644
+--- a/base/allocator/BUILD.gn
++++ b/base/allocator/BUILD.gn
+@@ -16,6 +16,7 @@ declare_args() {
+ # The Windows-only allocator shim is only enabled for Release static builds, and
+ # is mutually exclusive with the generalized shim.
+ win_use_allocator_shim = is_win && !is_component_build && !is_debug &&
++                         !is_electron_build &&
+                          !use_experimental_allocator_shim && !is_asan
+ 
+ # This "allocator" meta-target will forward to the default allocator according
 diff --git a/build/config/BUILDCONFIG.gn b/build/config/BUILDCONFIG.gn
 index d055e70..c76ca27 100644
 --- a/build/config/BUILDCONFIG.gn
@@ -19,6 +31,19 @@ index d055e70..c76ca27 100644
  ]
  if (is_win) {
    default_compiler_configs += [
+diff --git a/build/config/win/BUILD.gn b/build/config/win/BUILD.gn
+index 5e1f7fcc4d83..15723e6b7184 100644
+--- a/build/config/win/BUILD.gn
++++ b/build/config/win/BUILD.gn
+@@ -276,7 +276,7 @@ config("common_linker_setup") {
+ # See https://msdn.microsoft.com/en-us/library/2kzt1wy3.aspx for a reference of
+ # what each value does.
+ config("default_crt") {
+-  if (is_component_build) {
++  if (is_component_build || is_electron_build) {
+     # Component mode: dynamic CRT. Since the library is shared, it requires
+     # exceptions or will give errors about things not matching, so keep
+     # exceptions on.
 diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
 index 15bf689..9cdc19d 100644
 --- a/third_party/WebKit/Source/platform/BUILD.gn