Revert 285458 "Disable exceptions on Windows in all builds (take 3)"

BUG=397465

> Disable exceptions on Windows in all builds (take 3)
> 
> They were previously enabled in shared_library builds for historical reasons.
> 
> This change is relevant for Clang, which currently doesn't support exceptions
> on Windows.
> 
> Previous attemps failed due to:
> - chrome_elf_unittests on x64 (crbug.com/396244)
>   Fixed in Chromium r285377.
> 
> - blink_platform_unittests:DateTimeFormatTest.CommonPattern et al.
>   Fixed in Blink r176189
> 
> BUG=82385
> TBR=thakis
> 
> Review URL: https://codereview.chromium.org/420593002

TBR=hans@chromium.org

Review URL: https://codereview.chromium.org/418393002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285614 0039d316-1c4b-4281-b951-d872f2087c98

build/common.gypi

@@ -5116,8 +5116,6 @@
           'CERT_CHAIN_PARA_HAS_EXTRA_FIELDS',
           'WIN32_LEAN_AND_MEAN',
           '_ATL_NO_OPENGL',
-          # _HAS_EXCEPTIONS must match ExceptionHandling in msvs_settings.
-          '_HAS_EXCEPTIONS=0',
         ],
         'conditions': [
           ['buildtype=="Official"', {
@@ -5185,6 +5183,11 @@
               ],
             },
           ],
+          ['component=="static_library"', {
+            'defines': [
+              '_HAS_EXCEPTIONS=0',
+            ],
+          }],
           ['secure_atl', {
             'defines': [
               '_SECURE_ATL',
@@ -5267,8 +5270,13 @@
             'WarningLevel': '4',
             'WarnAsError': 'true',
             'DebugInformationFormat': '3',
-            # ExceptionHandling must match _HAS_EXCEPTIONS above.
-            'ExceptionHandling': '0',
+            'conditions': [
+              ['component=="shared_library"', {
+                'ExceptionHandling': '1',  # /EHsc
+              }, {
+                'ExceptionHandling': '0',
+              }],
+            ],
           },
           'VCLibrarianTool': {
             'AdditionalOptions': ['/ignore:4221'],