Revert "Fixed compiler warning C4267 'conversion from 'size_t' to 'type', possible loss of data'"

Seems to have quite a few warnings in 64-bit on my machine.

BUG=angleproject:1120

This reverts commit c5cf9bc47d0ee028adbbf9e9f94ca567eec601dc.

Change-Id: I86768b900aeba52e7a2242d9ae8949f93f1a5ba9
Reviewed-on: https://chromium-review.googlesource.com/293280
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>
diff --git a/src/libANGLE/renderer/gl/FramebufferGL.cpp b/src/libANGLE/renderer/gl/FramebufferGL.cpp
index 300980b..6c2101a 100644
--- a/src/libANGLE/renderer/gl/FramebufferGL.cpp
+++ b/src/libANGLE/renderer/gl/FramebufferGL.cpp
@@ -96,7 +96,8 @@
     if (!mIsDefault)
     {
         mStateManager->bindFramebuffer(GL_FRAMEBUFFER, mFramebufferID);
-        BindFramebufferAttachment(mFunctions, GL_COLOR_ATTACHMENT0 + static_cast<GLenum>(index),
+        BindFramebufferAttachment(mFunctions,
+                                  GL_COLOR_ATTACHMENT0 + index,
                                   mData.getColorAttachment(static_cast<unsigned int>(index)));
     }
 }
@@ -139,7 +140,7 @@
     if (!mIsDefault)
     {
         mStateManager->bindFramebuffer(GL_FRAMEBUFFER, mFramebufferID);
-        mFunctions->drawBuffers(static_cast<GLsizei>(count), buffers);
+        mFunctions->drawBuffers(count, buffers);
     }
 }
 
@@ -164,7 +165,7 @@
     if (mFunctions->invalidateFramebuffer)
     {
         mStateManager->bindFramebuffer(GL_FRAMEBUFFER, mFramebufferID);
-        mFunctions->invalidateFramebuffer(GL_FRAMEBUFFER, static_cast<GLsizei>(count), attachments);
+        mFunctions->invalidateFramebuffer(GL_FRAMEBUFFER, count, attachments);
     }
 
     return gl::Error(GL_NO_ERROR);
@@ -176,8 +177,7 @@
     if (mFunctions->invalidateSubFramebuffer)
     {
         mStateManager->bindFramebuffer(GL_FRAMEBUFFER, mFramebufferID);
-        mFunctions->invalidateSubFramebuffer(GL_FRAMEBUFFER, static_cast<GLsizei>(count),
-                                             attachments, area.x, area.y, area.width, area.height);
+        mFunctions->invalidateSubFramebuffer(GL_FRAMEBUFFER, count, attachments, area.x, area.y, area.width, area.height);
     }
 
     return gl::Error(GL_NO_ERROR);